Re: [Emc-users] Timing Belt

[Marshland Engineering]

>  Thats one piece of 
> certified 135 mph giddyup I still wish I had.

Pictures please.

Cheers Wallace


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[Emc-users] Timing Belt?

[Roland Jollivet]

You can see at 17s that those idlers are crowned, and even sitting up
against the flange.


On 18 April 2017 at 21:53, andy pugh  wrote:

> On 18 April 2017 at 19:51, Roland Jollivet 
> wrote:
> > Kuka don't have a problem doing it;
> > https://www.youtube.com/watch?v=iRKDfknqtbc
>
> Interesting.
>
> I looked at it for a lathe X-axis with a vertical motor shaft and
> concluded (from a CAD model) that the edges of the belt ended up
> different lengths.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
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Re: [Emc-users] Timing Belt

[Gene Heskett]

On Tuesday 18 April 2017 18:03:32 andy pugh wrote:

> On 18 April 2017 at 22:11, Marshland Engineering
>
>  wrote:
> > 2 Stroke motors have been doing this since the 1960.
>
> Very, very few of them. Most disc valves have been put on the end of
> the crank, and multi-cylinder ones have tended to use reed valves,
> which are entirely passive.

Or in the relatively massive center web of a 2 cylinder inline, deflector 
head engine. In the 1930's Johnson made a 2 cylinder 10 hp 2 stroke, 
unfortunately with deflector head pistons so it was all done at around 7 
grand. The clearances around the wide center of the crank probably were 
not sufficient to deny its touching the bronze bushing in the center of 
the crank when wound up tight as the one I had, was a Pacific Marine 
Bilge pump, so the crank was horizontal. I liked the looks of it, so I 
bored out the intake and fitted a single bowl carter carb with a 1.125" 
throat to replace the 5/8" throat Bing it came with, then threw away the 
flywheel and magneto because I didn't trust all that potential shrapnel 
with a 20 gauge piece of sheet metal between it and my back after I had 
made a swing mount for it and hung it on the axle of my Gopher GoKart.  
Both the flywheel and the magneto were replaced with a Bendix button 
magnet magneto that was probably good for 20,000+ revs. Needle bearing 
mains on each end of the crank, and I never saw a conrod big end like 
those, it was totally machined as one piece, the rod bolts drill and 
fitted, then it was broken off to separate the rod cap, with the 
breakage resembling cast iron, and the grain of the steel when bolted 
back together was so well matched that you could not find the break with 
a strong magnifying glass. And you could actually buy, from the local 
outboard engine shop, oversized replacement needle rollers and the 
bronze cage they ran in if it wore too loose. It took about 2000 revs to 
develop enough power to call it running so I always had some volunteers 
to pick up the back end and run about 10 feet before setting it back 
down to start it. It was up to around 3500 revs in another 15 feet, and 
throwing up a roostertail of dirt from the track until it was 4 stroking 
at around 7500 revs.  At 13.5 cid, I had to run in class C, so I rigged 
it so I could run booze and castor oil, or gas and Castrol. A 2.5 gallon 
tank on each side, one for fuel, one for water, which was circulated 
thru an old Nash heater core under the steering wheel hoop took care of 
the cooling for long enough I was out of booze.  Thats one piece of 
certified 135 mph giddyup I still wish I had.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Timing Belt?

[Gregg Eshelman]

Got a 3D printer? Could design a spherical hub with external splines and a 
split pulley to fit around the hub. The splines on the hub would have to be 
tapered so the pulleys can tilt.Would be something interesting to try with 
fairly loose tolerances on an FDM printer for prototyping the pulleys.
A higher resolution technology would have to be used for a production use part.
One of the coolest uses I've come across for 3D printing is new exhaust stacks 
for the engine in a P-51D Mustang. The WW2 originals were made of four pieces 
of stainless steel with about 3 feet of hand welding. The exhaust thrust adds 3 
to 4 knots to the plane's speed.
The article I read showed that 2 stacks have been made with laser sintered 
stainless steel powder. An original was 3D scanned then smoothed to get rid of 
rough spots from the welds. They seem to improve efficiency, in a picture of 
the plane running, with the new stacks on the front two cylinders on the left 
bank, there's no visible flame from them, nut there is from all the others. At 
$1,000+ an hour operating cost to fly a warbird, any improvement in efficiency 
is a big deal. For P-51 owners not super concerned with originality, the 
exhaust stack design could be optimized not only for best flow but also to 
produce more thrust.
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Re: [Emc-users] Timing Belt?

[andy pugh]

On 18 April 2017 at 19:51, Roland Jollivet  wrote:
> Kuka don't have a problem doing it;
> https://www.youtube.com/watch?v=iRKDfknqtbc

Interesting.

I looked at it for a lathe X-axis with a vertical motor shaft and
concluded (from a CAD model) that the edges of the belt ended up
different lengths.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Timing Belt?

[Todd Zuercher]

Wow, I bet those are fun to put together.  I wouldn't want to be the one who 
has to snake those belts in there.

- Original Message -
From: "Roland Jollivet" <roland.jolli...@gmail.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Tuesday, April 18, 2017 2:51:47 PM
Subject: [Emc-users]  Timing Belt?

Kuka don't have a problem doing it;
https://www.youtube.com/watch?v=iRKDfknqtbc

I was really surprised to see this, and the belts look rather flimsy for
the calibre of robot. Although there is still some gearing in the joint
itself.



On 18 April 2017 at 17:32, andy pugh <bodge...@gmail.com> wrote:

> On 18 April 2017 at 16:01, Todd  Zuercher
> <zuerc...@embarqmail.com> wrote:
> > Is it possible to connect two shafts at 90degrees to each other with a
> timing belt?
>
> I have looked into this, and I am pretty sure that the answer is "no"
>
> However, I think you can do it with this style:
> http://www.automotioncomponents.co.uk/en/catalog/rotary/chains-belts-
> pulleys/3d-chain-sprockets
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
> --
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> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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[Emc-users] Timing Belt?

[Roland Jollivet]

Kuka don't have a problem doing it;
https://www.youtube.com/watch?v=iRKDfknqtbc

I was really surprised to see this, and the belts look rather flimsy for
the calibre of robot. Although there is still some gearing in the joint
itself.



On 18 April 2017 at 17:32, andy pugh  wrote:

> On 18 April 2017 at 16:01, Todd  Zuercher
>  wrote:
> > Is it possible to connect two shafts at 90degrees to each other with a
> timing belt?
>
> I have looked into this, and I am pretty sure that the answer is "no"
>
> However, I think you can do it with this style:
> http://www.automotioncomponents.co.uk/en/catalog/rotary/chains-belts-
> pulleys/3d-chain-sprockets
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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Re: [Emc-users] Timing Belt?

[Jon Elson]

On 04/18/2017 10:01 AM, Todd Zuercher wrote:
> Is it possible to connect two shafts at 90degrees to each other with a timing 
> belt?
>
W. M. Berg (now assimilated into Stock Drive 
Products/Sterling Instruments) used to have a whole line of 
tricky "belts" for these special cases.  Generally, they 
were either one or two steel aircraft cables with molded-on 
teeth.  They had a variety for different kinds of bends and 
applied loads.  I use a flavor of them on my mill to couple 
the tachometers to the encoder shafts, although no bends out 
of the plane.  When exposed to oil, they have a life of at 
least 10 years, but I have had some of them start to crumble 
the plastic.

Jon

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Re: [Emc-users] Timing Belt?

[andy pugh]

On 18 April 2017 at 16:01, Todd  Zuercher
 wrote:
> Is it possible to connect two shafts at 90degrees to each other with a timing 
> belt?

I have looked into this, and I am pretty sure that the answer is "no"

However, I think you can do it with this style:
http://www.automotioncomponents.co.uk/en/catalog/rotary/chains-belts-pulleys/3d-chain-sprockets

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Timing Belt?

[Dave Caroline]

Better off with helical or bevel gears for 90 degrees I think.
Else you will have to space widely and go over shaped rollers so it
arrives at the pulleys square and hope it does not wear too fast. flat
belts used some crafty alignment and crowned pulleys for this.

Dave Caroline

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[Emc-users] Timing Belt?

[Todd Zuercher]

Is it possible to connect two shafts at 90degrees to each other with a timing 
belt? 

-- 

 

Todd Zuercher 
mailto:zuerc...@embarqmail.com 

 
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Re: [Emc-users] Timing Belt Calculator

[Gene Heskett]

On Thursday 02 June 2016 00:13:19 MC Cason wrote:

> Gene,
>
>In my email today, I received a link to a belt calculator from
> Misumi.  It asks for much more detail about your motor, and setup.   
> I figured it maybe something you could save for later use.
>
>Here's the link:
> http://fawos.misumi.jp/FA_WEB/pulley_us/index.php

Thanks, the other one always requires an enter on the first value, top 
center of the page, before it will recalc when playing what it.

>BTW, I've ordered parts from them in the past.  $8.00ish shipping
> from Japan.  For my project, I though it was pretty reasonable.

No, from Japan, thats quite reasonable, and I'd expect a higher overall 
quality too.

Thanks.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] Timing Belt Calculator

[MC Cason]

Gene,

   In my email today, I received a link to a belt calculator from 
Misumi.  It asks for much more detail about your motor, and setup.I 
figured it maybe something you could save for later use.

   Here's the link:
http://fawos.misumi.jp/FA_WEB/pulley_us/index.php

   BTW, I've ordered parts from them in the past.  $8.00ish shipping 
from Japan.  For my project, I though it was pretty reasonable.

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github.com/mcason/Eagle3D



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Re: [Emc-users] Timing belt size? --> Microstepping accuracy

[Gregg Eshelman]

That's why it won't go more than 1/2 step. 400 1/2 steps through a 2:1 
reduction makes 800 per lead screw revolution. With the 16mm per turn ball 
screw that will get 0.02mm carriage movement per motor 1/2 step.
Translation. Good enough for the intended use for the lathe.



 
  From: Nicklas Karlsson <nicklas.karlsso...@gmail.com>
 To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> 
 Sent: Wednesday, April 27, 2016 5:25 AM
 Subject: Re: [Emc-users] Timing belt size? --> Microstepping accuracy
   
> Also please be aware of
> http://www.micromo.com/microstepping-myths-and-realities
> 
> a consistent amount of movement from a microstep is not going to happen
> 
> Dave Caroline

I expect very little increased acccuracy for microstepping like 32 microsteps 
instead of one full step. I however expect smother motion, less noise and not 
the least less wear.


Nicklas Karlsson

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Re: [Emc-users] Timing belt size?

[Gene Heskett]

On Wednesday 27 April 2016 04:34:33 Gregg Eshelman wrote:

> Center distance of the shafts for the motor and leadscrew on my lathe
> are just a bit over 77mm. Motor shaft is 3/8". Screw shaft is 10mm.
> (Yup, surplus parts, ya gets what there is.) I want to do a 2:1
> reduction, which with 1/2 stepping the 200 step motor will get 0.02 mm
> move per step from the 16 mm per turn ball screw. It's a 9x20 lathe
> and the motor is a Slo-Syn brand, label says 450oz holding torque.
> Specs on the motor say 5% accuracy so I wouldn't expect 1/16th
> stepping to consistently produce 0.01 mm movement with a 2:1
> reduction.
>
> There's very little adjustment on the motor mount so I'll likely need
> to use a smooth idler against the back of the belt. There is room
> where I could put an idler on the inside of the belt and use some
> arbitrary length, but shorter belt = stiffer and better accuracy,
> right?
>
> Recommendations on pulleys, tooth profile and belt length / number of
> teeth? I have lathes so I can ream a 3/8" out to 10mm.

Not a recommendation Gregg, but I didn't use a belt for Z drive on my 
7x12. I'd bought a full set of metal change gears for it and since I 
wasn't using them anymore, I made miniature taper-lock hubs for two of 
them. 1/4" bore on the 425 motor into a 40 tooth gear, and a 10mm for 
the stub of the 16x5mm Z screw I used was fitted into one of the 80 
teeth gears for a 2/1 reduction.  But my 2m542 driver is set for a /8 
microstep as that got me a huge reduction in gear rattling when combined 
with a damper on the other end of the motor.  With about 37 volts for 
the motors, my rapids on the Z are set for 60 IPM limit which is a bit 
of overkill for a 7x12, but its bulletproof.  And if I run it into the 
tailstock it just shoves it on down the bed even if its tightened well 
for drilling a big hole.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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Re: [Emc-users] Timing belt size? --> Microstepping accuracy

[Nicklas Karlsson]

> Also please be aware of
> http://www.micromo.com/microstepping-myths-and-realities
> 
> a consistent amount of movement from a microstep is not going to happen
> 
> Dave Caroline

I expect very little increased acccuracy for microstepping like 32 microsteps 
instead of one full step. I however expect smother motion, less noise and not 
the least less wear.


Nicklas Karlsson

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Re: [Emc-users] Timing belt size?

[Dave Caroline]

Also please be aware of
http://www.micromo.com/microstepping-myths-and-realities

a consistent amount of movement from a microstep is not going to happen

Dave Caroline

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Re: [Emc-users] Timing belt size?

[andy pugh]

On 27 April 2016 at 09:34, Gregg Eshelman  wrote:
> Recommendations on pulleys, tooth profile and belt length / number of teeth? 
> I have lathes so I can ream a 3/8" out to 10mm.

This might help
http://www.hpcgears.com/n/left_menu/calc/calc.php

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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[Emc-users] Timing belt size?

[Gregg Eshelman]

Center distance of the shafts for the motor and leadscrew on my lathe are just 
a bit over 77mm. Motor shaft is 3/8". Screw shaft is 10mm. (Yup, surplus parts, 
ya gets what there is.)
I want to do a 2:1 reduction, which with 1/2 stepping the 200 step motor will 
get 0.02 mm move per step from the 16 mm per turn ball screw.
It's a 9x20 lathe and the motor is a Slo-Syn brand, label says 450oz holding 
torque. Specs on the motor say 5% accuracy so I wouldn't expect 1/16th stepping 
to consistently produce 0.01 mm movement with a 2:1 reduction.

There's very little adjustment on the motor mount so I'll likely need to use a 
smooth idler against the back of the belt. There is room where I could put an 
idler on the inside of the belt and use some arbitrary length, but shorter belt 
= stiffer and better accuracy, right?

Recommendations on pulleys, tooth profile and belt length / number of teeth? I 
have lathes so I can ream a 3/8" out to 10mm.
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Re: [Emc-users] Timing belt system

[Andy Pugh]

On 15 Jun 2013, at 06:38, Cecil Thomas wctho...@chartertn.net wrote:

 Does anyone have any reason for picking the L series over the T10 due 
 to cost, availability, load capacity etc between the two either for 
 the belts themselves or for the pulleys.

I would choose purely on the basis of availability. 
I have the hob to cut T5 on anything if you find you need something very 
custom. (And eBay.co.uk has the hobs for many other profiles, though listed as 
gear hobs)
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Re: [Emc-users] Timing belt system

[Sven Wesley]

2013/6/15 Andy Pugh bodge...@gmail.com:
 On 15 Jun 2013, at 06:38, Cecil Thomas wctho...@chartertn.net wrote:
 Does anyone have any reason for picking the L series over the T10 due
 to cost, availability, load capacity etc between the two either for
 the belts themselves or for the pulleys.

 I would choose purely on the basis of availability.
 I have the hob to cut T5 on anything if you find you need something very 
 custom. (And eBay.co.uk has the hobs for many other profiles, though listed 
 as gear hobs)

I run my steel router with really tiny timing belts (~3:1 factor) and
I think it is a T5. They can take uge loads even at at small sizes. If
you go bananas and want to make the hobs yourself a T10 is easier to
make as you can use larger cutters. Otherwise I'm with Andy,
availability is a strong keyword.

/S

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[Emc-users] Timing belt system

[Cecil Thomas]

In my 10EE CNC conversion I have decided to go to either a type L 
(.375 between teeth) or type T10 (10 mm between teeth).  I think I 
will need the belts to be heavier than the XL that I used on my 
Millrite conversion because the apron drive will require 12 inches 
between the pulleys.

Does anyone have any reason for picking the L series over the T10 due 
to cost, availability, load capacity etc between the two either for 
the belts themselves or for the pulleys.

I have done a little googling on the subject but can find no direct 
comparisons of the two.  If anyone has positive or negative 
experience with either it might save me time or money down the road.

Thanks,
Cecil


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Re: [Emc-users] Timing Belt Config

[John Thornton]

On 11 Nov 2009 at 19:27, Jeshua Lacock wrote:

 
 Thanks John,
 
 If I am using a servo with 512 PPR, is a step 1/512 of a revolution?

If your servo drives take step and direction signals then they are just like 
steppers to the 
software. If it takes 512 steps to go one revolution and it takes two 
revolutions to move one 
inch then your scale is 1024 = the number of steps to move one inch (or mm).

 I  
 guess I do not know how step/microsteps apply to servos...

It would not apply to servos only to drives that take step and direction 
signals. Steps and 
micro steps and gear ratios and pulleys all add up to one thing how many 
pulses does it 
take to go one unit. 

If you have servo drives that take PWM or 0-10v signals and feed back position 
info to EMC 
via an encoder then that is a whole different beast.

 
 Is it possible with EMC to command the servo to move 1 revolution
 (or  
 a specific number of steps) instead of specifying a distance?

If you set your scale correctly I assume you could... dunno why you would want 
to

John

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Re: [Emc-users] Timing Belt Config

[Jeshua Lacock]

On Nov 12, 2009, at 4:55 AM, John Thornton wrote:

 If I am using a servo with 512 PPR, is a step 1/512 of a revolution?

 If your servo drives take step and direction signals then they are  
 just like steppers to the
 software. If it takes 512 steps to go one revolution and it takes  
 two revolutions to move one
 inch then your scale is 1024 = the number of steps to move one inch  
 (or mm).

Thanks for confirming that John.

 I
 guess I do not know how step/microsteps apply to servos...

 It would not apply to servos only to drives that take step and  
 direction signals. Steps and
 micro steps and gear ratios and pulleys all add up to one thing how  
 many pulses does it
 take to go one unit.

 If you have servo drives that take PWM or 0-10v signals and feed  
 back position info to EMC
 via an encoder then that is a whole different beast.

Got it. I thought I read somewhere that servos are treated like a step  
motor from EMC.

My encoders send the signal back to the Gecko 320's. So I assume that  
the Gecko knows the position of the servo and EMC instructs it where  
to move. This is just speculation on my part, so I could be wrong.

 Is it possible with EMC to command the servo to move 1 revolution
 (or
 a specific number of steps) instead of specifying a distance?

 If you set your scale correctly I assume you could... dunno why you  
 would want to

I was thinking it would allow me to set the scale. I could tell it to  
do 512 steps and measure, or 25,600 steps and measure the distance the  
belt moves..


Thanks again,

Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
http://3DTOPO.com
Phone: 208.462.4171


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Re: [Emc-users] Timing Belt Config

[Stephen Wille Padnos]

Jeshua Lacock wrote:

On Nov 12, 2009, at 4:55 AM, John Thornton wrote:
  

If I am using a servo with 512 PPR, is a step 1/512 of a revolution?
  

If your servo drives take step and direction signals then they are  
just like steppers to the
software. If it takes 512 steps to go one revolution and it takes  
two revolutions to move one
inch then your scale is 1024 = the number of steps to move one inch  
(or mm).



Thanks for confirming that John.

  

I
guess I do not know how step/microsteps apply to servos...
  

It would not apply to servos only to drives that take step and  
direction signals. Steps and
micro steps and gear ratios and pulleys all add up to one thing how  
many pulses does it
take to go one unit.

If you have servo drives that take PWM or 0-10v signals and feed  
back position info to EMC
via an encoder then that is a whole different beast.



Got it. I thought I read somewhere that servos are treated like a step  
motor from EMC.
  

No, that's only when you use step/dir servo drives, such as the Geckos.  
It is better to treat servos like servos, by using a drive that takes an 
analog command as input, and makes the motor go a certain speed 
(velocity mode) or apply a certain torque (torque mode) based on that input.

My encoders send the signal back to the Gecko 320's. So I assume that  
the Gecko knows the position of the servo and EMC instructs it where  
to move.

Sort of.  The geckos have an internal counter.  The counter is changed 
by the computer (from the step/dir signals) and by the encoder feedback 
signals.  The electronics in the gecko will basically apply power to the 
motor to make the counter stay at zero, so when the PC issues a step 
(changing the counter to 1, for example), the motor will be pushed 
until the encoder feedback makes the counter zero again.

 This is just speculation on my part, so I could be wrong.
  

Yep, you are, sort of  :)

Is it possible with EMC to command the servo to move 1 revolution
(or
a specific number of steps) instead of specifying a distance?
  

If you set your scale correctly I assume you could... dunno why you  
would want to


I was thinking it would allow me to set the scale. I could tell it to  
do 512 steps and measure, or 25,600 steps and measure the distance the  
belt moves..
  

Set the scale to something (like 1000), then tell EMC2 to move 1 inch.  
Measure the actual travel, and then re-set the scale to 1000*(expected 
travel)/(actual travel).  Make sure the number looks sane - you should 
be able to verify it if you know the encoder resolution, gear ratio, and 
screw pitch.  Use a longer test travel distance once you're close - the 
difference between 1000 count encoders and 1024 count encoders, or the 
difference between 5mm and 0.2 inches per screw turn can be pretty subtle.

- Steve


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Re: [Emc-users] Timing Belt Config

[Jeshua Lacock]

On Nov 10, 2009, at 3:27 PM, John Thornton wrote:

 What you need to figure out is how far the axis moves per rotation.  
 For example if your
 motor turns 4 times to turn the big pulley once and the table  
 travels 2 inches then it is 2
 turns per inch. If it is 200 pulses per revolution and 10 microsteps  
 then you have
 200 x 10 x 2 steps per inch. At the bottom of the page you can see  
 the scale calculate as
 you enter in values. The only value that really matters is the  
 actual scale number.

Thanks John,

If I am using a servo with 512 PPR, is a step 1/512 of a revolution? I  
guess I do not know how step/microsteps apply to servos...

Is it possible with EMC to command the servo to move 1 revolution (or  
a specific number of steps) instead of specifying a distance?

 I have belt drive plasma cutter and the calculations don't quite  
 come out exact with the belt.
 It depends on how much belt stretch you have. Once you get it close  
 take a measurement
 and the move a large amount then measure. Do the math to figure out  
 the exact scale you
 need to get a movement of one unit. For example one of my axis  
 calculated scale is 4000
 but because of belt stretch I need 3980 to get a more accurate  
 movement.


That makes sense!


Thanks again,

Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
http://3DTOPO.com
Phone: 208.462.4171


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[Emc-users] Timing Belt Config

[Jeshua Lacock]

Greetings,

I am trying to calibrate my shiny new machine. I have opted to use  
timing belts instead of leadscrews.

My servos have 512-count optical encoders driven by Gecko 320's. I  
have all the pins set up, and are working nicely!

The servos are geared down 4 to 1 (four servo revolutions per pulley  
revolution that runs main timing belt).

My question is, what would I put for the Leadscrew pitch in the Axis  
Configuration Page? I assume for the Pulley Teeth I would enter 4:1.

I greatly appreciate any advice!

In case anyone is interested, pics of the machine are at:

http://OpenOSX.com/CNC-11.9.09/


Cheers,

Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
http://3DTOPO.com
Phone: 208.462.4171


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Re: [Emc-users] Timing Belt Config

[Andy Pugh]

2009/11/10 Jeshua Lacock jes...@3dtopo.com:

 My question is, what would I put for the Leadscrew pitch in the Axis
 Configuration Page? I assume for the Pulley Teeth I would enter 4:1.

It will depend on how many teeth are on your axis belt pulleys, and the pitch.

Stepconf will just put steps x microsteps x ratio x pitch into the
AXIS_SCALE parameter in the .ini file which is the number of step
pulses per unit of movement.

It might be easiest to put nonsense in that part, then calculate the
scale yourself and edit the ini file.

 In case anyone is interested, pics of the machine are at:

        http://OpenOSX.com/CNC-11.9.09/

I am interested to know if you have an EMC build for OSX :-)

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Re: [Emc-users] Timing Belt Config

[John Thornton]

What you need to figure out is how far the axis moves per rotation. For example 
if your 
motor turns 4 times to turn the big pulley once and the table travels 2 inches 
then it is 2 
turns per inch. If it is 200 pulses per revolution and 10 microsteps then you 
have 
200 x 10 x 2 steps per inch. At the bottom of the page you can see the scale 
calculate as 
you enter in values. The only value that really matters is the actual scale 
number. 

I have belt drive plasma cutter and the calculations don't quite come out exact 
with the belt. 
It depends on how much belt stretch you have. Once you get it close take a 
measurement 
and the move a large amount then measure. Do the math to figure out the exact 
scale you 
need to get a movement of one unit. For example one of my axis calculated scale 
is 4000 
but because of belt stretch I need 3980 to get a more accurate movement.

John

On 10 Nov 2009 at 13:08, Jeshua Lacock wrote:

 
 Greetings,
 
 I am trying to calibrate my shiny new machine. I have opted to use 
 timing belts instead of leadscrews.
 
 My servos have 512-count optical encoders driven by Gecko 320's. I 
 have all the pins set up, and are working nicely!
 
 The servos are geared down 4 to 1 (four servo revolutions per pulley
 revolution that runs main timing belt).
 
 My question is, what would I put for the Leadscrew pitch in the
 Axis  
 Configuration Page? I assume for the Pulley Teeth I would enter
 4:1.
 
 I greatly appreciate any advice!
 
 In case anyone is interested, pics of the machine are at:
 
   http://OpenOSX.com/CNC-11.9.09/
 
 
 Cheers,
 
 Jeshua Lacock
 Founder/Programmer
 3DTOPO Incorporated
 http://3DTOPO.com
 Phone: 208.462.4171
 
 
 
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Re: [Emc-users] Timing Belt Config

[Jeff Epler]

If stepconf's questions to calculate SCALE don't fit your situation,
then perform the calculation yourself to get steps/mm or steps/in.
Enter this value in motor steps per revolution, and enter 1 for
microstepping, pulley, and leadscrew pitch.  This will let you use the
number you calculated without hand-editing the inifile.

Jeff

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Re: [Emc-users] Timing Belt Config

[Jeshua Lacock]

On Nov 10, 2009, at 3:10 PM, Andy Pugh wrote:

 In case anyone is interested, pics of the machine are at:

http://OpenOSX.com/CNC-11.9.09/

 I am interested to know if you have an EMC build for OSX :-)


Thanks Andy!

(Thanks everyone for your helpful suggestions!)

The crux for me was lack of a working parallel port - I spent much  
time looking into it.

There might be some USB solutions, but would like require developing a  
custom kernel extension.

I think everything else including RTAI could pretty easily be ported.

But I picked up a working PC from the dump, installed the EMC Live CD,  
and am quite happy. I can control the remote machine over VNC so it is  
pretty sweet.


Cheers,

Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
http://3DTOPO.com
Phone: 208.462.4171


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Re: [Emc-users] Timing Belt Config

[Gene Heskett]

On Tuesday 10 November 2009, Jeshua Lacock wrote:
On Nov 10, 2009, at 3:10 PM, Andy Pugh wrote:
 In case anyone is interested, pics of the machine are at:

http://OpenOSX.com/CNC-11.9.09/

 I am interested to know if you have an EMC build for OSX :-)

Thanks Andy!

(Thanks everyone for your helpful suggestions!)

The crux for me was lack of a working parallel port - I spent much
time looking into it.

There might be some USB solutions, but would like require developing a
custom kernel extension.

I think everything else including RTAI could pretty easily be ported.

But I picked up a working PC from the dump, installed the EMC Live CD,
and am quite happy. I can control the remote machine over VNC so it is
pretty sweet.

I start an ssh session with 'ssh -Y -l name shop.coyote.den' and just export 
the x sessions I run to my nice warm easy chair.

Cheers,

Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
http://3DTOPO.com

Mmmm, good.  You live in Gods country.

Phone: 208.462.4171

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