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
-- 
"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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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."
— George Fitch, Atlanta Constitution Newspaper, 1916

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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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your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
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