Re: [Emc-users] More on the BS-1

[Chris Albertson]

This is not LCNC specif, but just motion control...

Many times the secret is to do the homing twice.  Once at full speed and as
you note it overshoots.   Then backup up until you bump the switch again
then finally move as you say as 0.1 degrees per second.  You don't need to
actually stop at the home, just note the encoder count as you pass as the
switch trips

Look at you 3D printer for inspiration.  I think it goes fst to get a
rough-homethen hits it slow a few times to take an average.

Also for a rotary table I wonder if you could use a push button on a
control pannel.   You define home to be whatever you want.   For example if
you need to make 20 cuts to cut a gear, do you care where the firth tooth
is on the black?



On Thu, Dec 17, 2020 at 11:37 PM Gene Heskett  wrote:

> On Thursday 17 December 2020 12:07:32 Gene Heskett wrote:
>
> > Greetings all;
> >
> > I have it working fairly well but had to restrict the cruising speed
> > and accells to get the following error under control, not enough
> > headroom in the supply or controller to do any better.  Setting those
> > down to 25 and 120 pretty well got rid of the big swings at start and
> > stop, now staying within 5 millivolts on the halscope.  It seem it
> > needs the headroom of cruising at around 60% pwm duty to get up to
> > speed and stopped again without lots of ringing at the start/stop
> > points, and its stopping just prior to perfect balance from either
> > direction, like .002 degrees or less despite a pretty aggressive Igain
> > which some have used to get it to stop in the deadband. At a MAXVEL of
> > 30 degrees/sec there is an occasional hint of windup, and MAX_ACCEL
> > above 120 makes a big bump getting started and rings like a bell
> > stopping, 25 and 120 make it behave really well.  To improve on that,
> > I'd have to use one of Jons pwm-servos, powered by the spindle psu at
> > 125 volts.  I'd like to see it turn faster, but at what cost?  Its a
> > 24 volt motor. Pix in a day or so when I get it reassembled and ready
> > to rock and roll.
> >
> > Cheers, Gene Heskett
>
> One last problem. Ballistics before its homed may prevent homing, the
> accel is very slow, at least 5 seconds to get up to cruising speed and
> it winds up and coasts for several seconds after finger lift. so by the
> time it finds the home switch it will have coasted many degrees past it.
>
> This is NOT how it acts after being homed wherever it is by all zeros in
> the ini file. Then its moving and stopping according to the A settings
> in the ini file, which are 25 degrees cruising and 120 accel.
>
> What do I set in the ini file that will give it close to the same
> ballistics it has after homing? Or am I stuck searching for the home
> switch at 0.125 degrees/sec or less? That would be beyond boring if it
> was 1 degree beyond the switch and had to move 358 degrees to find it
> again.
>
> Thanks all.
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] More on the BS-1

[Gene Heskett]

On Thursday 17 December 2020 12:07:32 Gene Heskett wrote:

> Greetings all;
>
> I have it working fairly well but had to restrict the cruising speed
> and accells to get the following error under control, not enough
> headroom in the supply or controller to do any better.  Setting those
> down to 25 and 120 pretty well got rid of the big swings at start and
> stop, now staying within 5 millivolts on the halscope.  It seem it
> needs the headroom of cruising at around 60% pwm duty to get up to
> speed and stopped again without lots of ringing at the start/stop
> points, and its stopping just prior to perfect balance from either
> direction, like .002 degrees or less despite a pretty aggressive Igain
> which some have used to get it to stop in the deadband. At a MAXVEL of
> 30 degrees/sec there is an occasional hint of windup, and MAX_ACCEL
> above 120 makes a big bump getting started and rings like a bell
> stopping, 25 and 120 make it behave really well.  To improve on that,
> I'd have to use one of Jons pwm-servos, powered by the spindle psu at
> 125 volts.  I'd like to see it turn faster, but at what cost?  Its a
> 24 volt motor. Pix in a day or so when I get it reassembled and ready
> to rock and roll.
>
> Cheers, Gene Heskett

One last problem. Ballistics before its homed may prevent homing, the 
accel is very slow, at least 5 seconds to get up to cruising speed and 
it winds up and coasts for several seconds after finger lift. so by the 
time it finds the home switch it will have coasted many degrees past it.  

This is NOT how it acts after being homed wherever it is by all zeros in 
the ini file. Then its moving and stopping according to the A settings 
in the ini file, which are 25 degrees cruising and 120 accel.

What do I set in the ini file that will give it close to the same 
ballistics it has after homing? Or am I stuck searching for the home 
switch at 0.125 degrees/sec or less? That would be beyond boring if it 
was 1 degree beyond the switch and had to move 358 degrees to find it 
again.

Thanks all.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] 7i96 multi wire input

[Sven Wesley]

Den tors 17 dec. 2020 01:22Gene Heskett  skrev:

> On Wednesday 16 December 2020 17:42:58 Sven Wesley wrote:
>
> > Den tors 10 dec. 2020 kl 15:31 skrev Gene Heskett
> :
> > > But, I'll also state that my way is not the only way, There are
> > > (N-1)! ways to do it where N is the number of inputs you need to
> > > smunch into one wire to stop LCNC, and ! is the factorial symbol.
> > > And could be expanded to handle more fault sources easy enough as
> > > long as they all worked alike. With "work alike" defined as turning
> > > on an isolated switch when it faults.
> > >
> > > Take care Sven.
> > >
> > > Cheers, Gene Heskett
> >
> > Turns out it's all fine to run them all together. Got this drawing
> > from the designer of the driver.
> >
> >
> > [image: error-line.jpg]
>
> That is all fine if you don't care which driver did it, or simply don't
> have enough i/o and you can go inspect the drivers to see which one got
> the tummy ache. I did mine individually because I had the i/o to throw
> away, and still do, probaly 40 unused i/o's yet. And while the drivers
> are accessible, its not all that convenient.  Safety wise, this is 100%
> functional.
>
> Cheers, Gene Heskett
>

All drivers have an LED that flashes when they are throwing an error. Only
the drive that causes an error flashes.
Not too many inputs on the 7i96 so I'm happy if I can save a few. :)

All the best,
Sven

>

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Re: [Emc-users] Tooling availability questions

[Gene Heskett]

On Thursday 17 December 2020 17:51:51 Chris Albertson wrote:

> If you have a BS1 with morterized index, you not want to hob gears but
> cut one tooth, rotate the gear and then cut the next.  You need a set
> of gear cutters for the size gear.  I has looking to buy some. 
> They are a little expensive so it is best to pick one or two size
> gears and then make everything for all you projects that size.
>
> Here is a set like the type I might buy.   This is a good size for
> most of the parts I'd want to make
> ebay.com/itm/Involute-Gear-cutter-set-M-0-5-pa-20-HSS...
> ule-M0-5-N1-N8/324281326460?hash=item4b80ac5b7c:g:OjEAAOSwRrVfT4wx> For
> some reason, so many of these seem to come from Russia
>
> The trouble with being a job-shop and making any random gear some one
> might need is that you'd need 20 of these sets and find that it is
> just cheaper to buy a premade gear and modify it.
>
> One set will allow you to make gears of a given module (or pitch if
> using the American system) and one pressure angle in any size from
> smallest possible to straight rack.
>
> If yu have need to make many 0.5 mod gears the above-linked set is a
> good deal.

I agree, not bad if hard enough to make good gears for a while. I can 
imagine coolant chemistry is important?

> On Thu, Dec 17, 2020 at 11:05 AM Gene Heskett  
wrote:
> > On Thursday 17 December 2020 12:46:35 andy pugh wrote:
> > > On Thu, 17 Dec 2020 at 17:40, Gene Heskett 
> >
> > wrote:
> > > > Is there available on the net, a good treatise of making gears
> > > > with something like this BS-1?
> > >
> > > Do you want to hob the gears or cut one tooth at a time?
> >
> > Either.
> >
> > > > And, is anyone grinding tools & making arbors to mount them?
> > >
> > > To mount what?
> >
> > Oh, I duuno, gear hobs maybe? This has an R8 spindle.
> >
> > > >  I have a
> > > > mental vision of buying replacement head gears for this G0704,
> > > > which are plastic, and making metallic gears to replace these as
> > > > the bearings, which are also used in roller skates, are getting
> > > > noisy.
> > >
> > > You might be able to  buy metal gears pre-made:
> > > https://littlemachineshop.com/products/search.php?tabName=Products
> > > m=metal+gears
> >
> > 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)
> > If we desire respect for the law, we must first make the law
> > respectable. - Louis D. Brandeis
> > Genes Web page 
> >
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users


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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Tooling availability questions

[Gene Heskett]

On Thursday 17 December 2020 14:33:20 Matthew Herd wrote:

> I’ll second Boston Gear.  I was able to get change gears for my Atlas
> lathe from them as off the shelf parts.

I'd go with Boston Gear, they were big already in the 1960's. had 
everything we needed to make a microwave frequency measuring cavity tool 
for intercity tv microwave stuff we were building at Tepco in RCSD. 
Sweet stuff, and at the accuracy level we needed, competitively priced.

The CE at KOTA-TV, Elmer Nelson also owned Tepco, and he designed and 
built all the microwave gear to get 2 of the networks from Denver, KLZ 
on Lookout Mountain to Skyline Drive and KOTA-TV in RCSD, and built the 
microwave stuff to get the network to KIVA-TV from a 1/4 watt splitter 
off the WTC site at Water Dog on the North edge of the Umcompagre 
plateau to the south edge and 2 more hops to North Mountain to the 
national park near Marcos Co and on into KIVA-TV south of Farmington NM 
a couple miles. Rock solid dependable stuff considering it was built 
when vacuum tubes were king. Nearly all the people on the western slope 
got their tv thru gear Elmer designed and built.
 
> > On Dec 17, 2020, at 2:29 PM, jrmitchellj 
> > wrote:
> >
> > Are you bent on making them yourself, or would you consider
> > purchasing?
> >
> > Check out Boston gear (bostongear,com) or Martin gear
> > (martinsprocket.com) as purchase option/
> >
> > --J. Ray Mitchell Jr.
> > jrmitche...@gmail.com
> >
> >
> > "Good enough is the enemy of excellence"author unknown
> >
> > On Thu, Dec 17, 2020 at 11:21 AM andy pugh  
wrote:
> >> On Thu, 17 Dec 2020 at 19:05, Gene Heskett  
wrote:
>  Do you want to hob the gears or cut one tooth at a time?
> >>>
> >>> Either.
> >>
> >> Well, there is always https://youtu.be/ZhICrb0Tbn4
> >> And: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing
> >>
> >> --
> >> 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, 1912
> >>
> >>
> >> ___
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >
> > ___
> > Emc-users mailing list
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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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Gecko G213V failed yet again.

[John Dammeyer]

Haven't actually.  I'll do that.  

However, the Chinese Stepper driver runs it like a charm other than an annoying 
3.6kHz whine when it's stopped.  Even with the dip switch set to reduce current 
to half when idle.  The whine is barely detectable with 2A per phase but then 
it won't run the load.
Also a 600oz-in motor I have here also turns nicely with the Chinese one and 
doesn't whine as loud though still at the same frequency.  And since it's half 
the length, half the whine probably makes sense.

I've just ordered an AC Servo to replace it.  It's the same size but will allow 
me 4x the speed.

John


> -Original Message-
> From: jrmitchellj [mailto:jrmitche...@gmail.com]
> Sent: December-17-20 3:23 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Gecko G213V failed yet again.
> 
> By chance have you checked if there is a continuity/resistance from one of
> the windings to the frame of the stepper?
> 
> --J. Ray Mitchell Jr.
> jrmitche...@gmail.com
> 
> 
> 
> "Good enough is the enemy of excellence"author unknown
> 
> 
> On Tue, Dec 8, 2020 at 3:17 PM John Dammeyer  wrote:
> 
> > Hi Gene,
> >
> > > From: Gene Heskett [mailto:ghesk...@shentel.net]
> > > On Tuesday 08 December 2020 02:04:49 John Dammeyer wrote:
> > >
> > > > > I think I'd be measuring the ohmage and inductance of each winding
> > > > > in that motor. A partially shorted winding would be on my suspects
> > > > > list.
> > > > >
> > > > > They should match within a few %. A 10% diff would condemn it in my
> > > > > CET mind.
> > > > >
> > > > > Cheers, Gene Heskett
> > > > > --
> > > >
> > > > Thanks for the suggestion.
> > > > I'll check that too although I'm leaning to epoxy PC board material
> > > > converted to conductive carbon.
> >
> > Unfortunately I can't see which transistor pins go to which terminal
> > pins.  But it appears there isn't a lot of conduction between the winding
> > pins since without the motor connected nothing gets warm.
> >
> > The winding resistances are the same and actually motion is quite smooth.
> >
> > But with the 58.5VDC toroidal power supply meant originally to run a 4
> > axis stepper conversion there's lots of power there to create the specified
> > current.  Now assume for example it's 7 amps and the motor measures at 1.2
> > ohms on each winding.  That's 8.4V steady state across the winding or 58W
> > in the motor.
> >
> > Now we know of course the chopper design will apply the 58V for as long as
> > needed to maintain say the 7A at the top of the micro-stepping curve.  So
> > assume we have 2 ohms DC resistance in a now burnt traces in between
> > layers.  With 7A through that 2 ohms there's a 14V drop.  Not a big deal
> > with the 58V supply.  But 14V and 7A is 98W.  Easily enough to slowly raise
> > the temperature.  And for all I know the resistance is even higher.
> >
> > I hit ESTOP which removes DC power.  Plugged the motor back in.  ESTOP off
> > and the reflective temperature probe shows the bottom pin of the connector
> > quickly reach 40C from 22C.  During all this time the motor itself is
> > barely warm.
> >
> > A far east stepper driver rated for up to 110VDC and 8A is on the way.  Be
> > here next Wednesday so then I can verify that it's the driver.
> >
> > And no answer back from Gecko.
> > John
> >
> >
> >
> >
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> >
> 
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Re: [Emc-users] Gecko G213V failed yet again.

[jrmitchellj]

By chance have you checked if there is a continuity/resistance from one of
the windings to the frame of the stepper?

--J. Ray Mitchell Jr.
jrmitche...@gmail.com



"Good enough is the enemy of excellence"author unknown


On Tue, Dec 8, 2020 at 3:17 PM John Dammeyer  wrote:

> Hi Gene,
>
> > From: Gene Heskett [mailto:ghesk...@shentel.net]
> > On Tuesday 08 December 2020 02:04:49 John Dammeyer wrote:
> >
> > > > I think I'd be measuring the ohmage and inductance of each winding
> > > > in that motor. A partially shorted winding would be on my suspects
> > > > list.
> > > >
> > > > They should match within a few %. A 10% diff would condemn it in my
> > > > CET mind.
> > > >
> > > > Cheers, Gene Heskett
> > > > --
> > >
> > > Thanks for the suggestion.
> > > I'll check that too although I'm leaning to epoxy PC board material
> > > converted to conductive carbon.
>
> Unfortunately I can't see which transistor pins go to which terminal
> pins.  But it appears there isn't a lot of conduction between the winding
> pins since without the motor connected nothing gets warm.
>
> The winding resistances are the same and actually motion is quite smooth.
>
> But with the 58.5VDC toroidal power supply meant originally to run a 4
> axis stepper conversion there's lots of power there to create the specified
> current.  Now assume for example it's 7 amps and the motor measures at 1.2
> ohms on each winding.  That's 8.4V steady state across the winding or 58W
> in the motor.
>
> Now we know of course the chopper design will apply the 58V for as long as
> needed to maintain say the 7A at the top of the micro-stepping curve.  So
> assume we have 2 ohms DC resistance in a now burnt traces in between
> layers.  With 7A through that 2 ohms there's a 14V drop.  Not a big deal
> with the 58V supply.  But 14V and 7A is 98W.  Easily enough to slowly raise
> the temperature.  And for all I know the resistance is even higher.
>
> I hit ESTOP which removes DC power.  Plugged the motor back in.  ESTOP off
> and the reflective temperature probe shows the bottom pin of the connector
> quickly reach 40C from 22C.  During all this time the motor itself is
> barely warm.
>
> A far east stepper driver rated for up to 110VDC and 8A is on the way.  Be
> here next Wednesday so then I can verify that it's the driver.
>
> And no answer back from Gecko.
> John
>
>
>
>
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Re: [Emc-users] Tooling availability questions

[Chris Albertson]

If you have a BS1 with morterized index, you not want to hob gears but cut
one tooth, rotate the gear and then cut the next.  You need a set of gear
cutters for the size gear.  I has looking to buy some.  They are a
little expensive so it is best to pick one or two size gears and then make
everything for all you projects that size.

Here is a set like the type I might buy.   This is a good size for most of
the parts I'd want to make
ebay.com/itm/Involute-Gear-cutter-set-M-0-5-pa-20-HSS...

For some reason, so many of these seem to come from Russia

The trouble with being a job-shop and making any random gear some one might
need is that you'd need 20 of these sets and find that it is just cheaper
to buy a premade gear and modify it.

One set will allow you to make gears of a given module (or pitch if using
the American system) and one pressure angle in any size from smallest
possible to straight rack.

If yu have need to make many 0.5 mod gears the above-linked set is a good
deal.

On Thu, Dec 17, 2020 at 11:05 AM Gene Heskett  wrote:

> On Thursday 17 December 2020 12:46:35 andy pugh wrote:
>
> > On Thu, 17 Dec 2020 at 17:40, Gene Heskett 
> wrote:
> > > Is there available on the net, a good treatise of making gears with
> > > something like this BS-1?
> >
> > Do you want to hob the gears or cut one tooth at a time?
>
> Either.
> > > And, is anyone grinding tools & making arbors to mount them?
> >
> > To mount what?
>
> Oh, I duuno, gear hobs maybe? This has an R8 spindle.
>
> > >  I have a
> > > mental vision of buying replacement head gears for this G0704, which
> > > are plastic, and making metallic gears to replace these as the
> > > bearings, which are also used in roller skates, are getting noisy.
> >
> > You might be able to  buy metal gears pre-made:
> > https://littlemachineshop.com/products/search.php?tabName=Products
> >m=metal+gears
>
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Tooling availability questions

[andy pugh]

On Thu, 17 Dec 2020 at 20:49, Frank Tkalcevic
 wrote:

> Not a website, but the book "Gears and Gear Cutting" from the workshop
> practice series shows how to make cutters and cut gears.

This one: 
https://www.amazon.com/Gears-Gear-Cutting-Workshop-Practice/dp/0852429118/

Definitely a good starting point.

-- 
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, 1912


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Re: [Emc-users] Tooling availability questions

[Frank Tkalcevic]

Not a website, but the book "Gears and Gear Cutting" from the workshop
practice series shows how to make cutters and cut gears.  (I've never tried
it myself)


-Original Message-
From: Gene Heskett [mailto:ghesk...@shentel.net] 
Sent: Friday, 18 December 2020 4:38 AM
To: 'Enhanced Machine Controller (EMC)'
Subject: [Emc-users] Tooling availability questions

Greetings all;

Is there available on the net, a good treatise of making gears with 
something like this BS-1?

And, is anyone grinding tools & making arbors to mount them? I have a 
mental vision of buying replacement head gears for this G0704, which are 
plastic, and making metallic gears to replace these as the bearings, 
which are also used in roller skates, are getting noisy. The lower 
quality ones sell on fleabay for around $4.00 a tube of ten but I'm sure 
there are far better replacements than that available.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Tooling availability questions

[Matthew Herd]

I’ll second Boston Gear.  I was able to get change gears for my Atlas lathe 
from them as off the shelf parts.

> On Dec 17, 2020, at 2:29 PM, jrmitchellj  wrote:
> 
> Are you bent on making them yourself, or would you consider purchasing?
> 
> Check out Boston gear (bostongear,com) or Martin gear (martinsprocket.com)
> as purchase option/
> 
> --J. Ray Mitchell Jr.
> jrmitche...@gmail.com
> 
> 
> "Good enough is the enemy of excellence"author unknown
> 
> 
> On Thu, Dec 17, 2020 at 11:21 AM andy pugh  wrote:
> 
>> On Thu, 17 Dec 2020 at 19:05, Gene Heskett  wrote:
>> 
 Do you want to hob the gears or cut one tooth at a time?
>>> 
>>> Either.
>> 
>> Well, there is always https://youtu.be/ZhICrb0Tbn4
>> And: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing
>> 
>> --
>> 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, 1912
>> 
>> 
>> ___
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>> 
> 
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Re: [Emc-users] Tooling availability questions

[jrmitchellj]

Are you bent on making them yourself, or would you consider purchasing?

Check out Boston gear (bostongear,com) or Martin gear (martinsprocket.com)
as purchase option/

--J. Ray Mitchell Jr.
jrmitche...@gmail.com


"Good enough is the enemy of excellence"author unknown


On Thu, Dec 17, 2020 at 11:21 AM andy pugh  wrote:

> On Thu, 17 Dec 2020 at 19:05, Gene Heskett  wrote:
>
> > > Do you want to hob the gears or cut one tooth at a time?
> >
> > Either.
>
> Well, there is always https://youtu.be/ZhICrb0Tbn4
> And: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing
>
> --
> 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, 1912
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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Re: [Emc-users] Tooling availability questions

[andy pugh]

On Thu, 17 Dec 2020 at 19:05, Gene Heskett  wrote:

> > Do you want to hob the gears or cut one tooth at a time?
>
> Either.

Well, there is always https://youtu.be/ZhICrb0Tbn4
And: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing

-- 
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, 1912


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Re: [Emc-users] Tooling availability questions

[Gene Heskett]

On Thursday 17 December 2020 14:03:18 Gene Heskett wrote:

> On Thursday 17 December 2020 12:46:35 andy pugh wrote:
> > On Thu, 17 Dec 2020 at 17:40, Gene Heskett 
>
> wrote:
> > > Is there available on the net, a good treatise of making gears
> > > with something like this BS-1?
> >
> > Do you want to hob the gears or cut one tooth at a time?
>
> Either.
>
> > > And, is anyone grinding tools & making arbors to mount them?
> >
> > To mount what?
>
> Oh, I duuno, gear hobs maybe? This has an R8 spindle.
>
> > >  I have a
> > > mental vision of buying replacement head gears for this G0704,
> > > which are plastic, and making metallic gears to replace these as
> > > the bearings, which are also used in roller skates, are getting
> > > noisy.
> >
> > You might be able to  buy metal gears pre-made:
> > https://littlemachineshop.com/products/search.php?tabName=Products
> >er m=metal+gears

Roger, at LMS, says the G0704 is the next size up from what they carry.

Thanks Andy.

> Cheers, Gene Heskett


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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Tooling availability questions

[Gene Heskett]

On Thursday 17 December 2020 12:46:35 andy pugh wrote:

> On Thu, 17 Dec 2020 at 17:40, Gene Heskett  
wrote:
> > Is there available on the net, a good treatise of making gears with
> > something like this BS-1?
>
> Do you want to hob the gears or cut one tooth at a time?

Either.
> > And, is anyone grinding tools & making arbors to mount them?
>
> To mount what?

Oh, I duuno, gear hobs maybe? This has an R8 spindle.

> >  I have a
> > mental vision of buying replacement head gears for this G0704, which
> > are plastic, and making metallic gears to replace these as the
> > bearings, which are also used in roller skates, are getting noisy.
>
> You might be able to  buy metal gears pre-made:
> https://littlemachineshop.com/products/search.php?tabName=Products
>m=metal+gears


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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Tooling availability questions

[andy pugh]

On Thu, 17 Dec 2020 at 17:40, Gene Heskett  wrote:

> Is there available on the net, a good treatise of making gears with
> something like this BS-1?

Do you want to hob the gears or cut one tooth at a time?

> And, is anyone grinding tools & making arbors to mount them?

To mount what?

>  I have a
> mental vision of buying replacement head gears for this G0704, which are
> plastic, and making metallic gears to replace these as the bearings,
> which are also used in roller skates, are getting noisy.

You might be able to  buy metal gears pre-made:
https://littlemachineshop.com/products/search.php?tabName=Products=metal+gears

-- 
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, 1912


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[Emc-users] Tooling availability questions

[Gene Heskett]

Greetings all;

Is there available on the net, a good treatise of making gears with 
something like this BS-1?

And, is anyone grinding tools & making arbors to mount them? I have a 
mental vision of buying replacement head gears for this G0704, which are 
plastic, and making metallic gears to replace these as the bearings, 
which are also used in roller skates, are getting noisy. The lower 
quality ones sell on fleabay for around $4.00 a tube of ten but I'm sure 
there are far better replacements than that available.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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[Emc-users] More on the BS-1

[Gene Heskett]

Greetings all;

I have it working fairly well but had to restrict the cruising speed and 
accells to get the following error under control, not enough headroom in 
the supply or controller to do any better.  Setting those down to 25 and 
120 pretty well got rid of the big swings at start and stop, now staying 
within 5 millivolts on the halscope.  It seem it needs the headroom of 
cruising at around 60% pwm duty to get up to speed and stopped again 
without lots of ringing at the start/stop points, and its stopping just 
prior to perfect balance from either direction, like .002 degrees or 
less despite a pretty aggressive Igain which some have used to get it to 
stop in the deadband. At a MAXVEL of 30 degrees/sec there is an 
occasional hint of windup, and MAX_ACCEL above 120 makes a big bump 
getting started and rings like a bell stopping, 25 and 120 make it 
behave really well.  To improve on that, I'd have to use one of Jons 
pwm-servos, powered by the spindle psu at 125 volts.  I'd like to see it 
turn faster, but at what cost?  Its a 24 volt motor. Pix in a day or so 
when I get it reassembled and ready to rock and roll.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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