electronic lead screw

RJSakowski said:
I did a couple of cuts using the ELS. I successfully turned a length of 1" HR with a feed of .030"/rev. and .030" d.o.c. @ 588 rpm. If I did the math right, that amounted to 1.66 cu. in./min which is a fairly healthy stock removal rate. This amounts to a feed of almost 18 ipm and a stepper speed of 423 rpm. (I use a 2:1 gear box reduction) so my stepper rpm is twice my lead screw rpm.)

When I tried .030"/rev. and .050 d.o.c., it stalled the lathe and chipped the insert in the process.

Looking a no load ceiling, at 3 mm/rev, the stepper tracks but it fails at 3.5mm/rev. This corresponds to stepper speeds of 1667 and 1945 rpm, and 69 and 81 ipm, respectively.

With that, I am fairly convinced that the ELS will be able to handle my needs.
Click to expand...
Great! Glad solution exists. Yeah 1900 rpm in bigger steppers is poking along a bit quick!
Max I achieved w mine, was about 1500 on the bench, so all good.
RJSakowski said:
I did a couple of cuts using the ELS. I successfully turned a length of 1" HR with a feed of .030"/rev. and .030" d.o.c. @ 588 rpm. If I did the math right, that amounted to 1.66 cu. in./min which is a fairly healthy stock removal rate. This amounts to a feed of almost 18 ipm and a stepper speed of 423 rpm. (I use a 2:1 gear box reduction) so my stepper rpm is twice my lead screw rpm.)

When I tried .030"/rev. and .050 d.o.c., it stalled the lathe and chipped the insert in the process.

Looking a no load ceiling, at 3 mm/rev, the stepper tracks but it fails at 3.5mm/rev. This corresponds to stepper speeds of 1667 and 1945 rpm, and 69 and 81 ipm, respectively.

With that, I am fairly convinced that the ELS will be able to handle my needs.
Click to expand...
Am sure 1.66 ci would suit me too RJ, well done. 50 thou doc on smaller lathes is pretty vicious. Mine's a bit bigger, heavier, and wouldn't try that.
Looks like your tests show that your LS not being overloaded with reasonable cuts.
What was the Nm rating of your stepper again?
(Being lazy here).
So what happened re finding the right driver tuning software ( u had asked Briney eye).?
 
Last edited:
Qtron said:
Great! Glad solution exists. Yeah 1900 rpm in bigger steppers is poking along a bit quick!
Max I achieved w mine, was about 1500 on the bench, so all good.

Am sure 1.66 ci would suit me too RJ, well done. 50 thou doc on smaller lathes is pretty vicious. Mine's a bit bigger, heavier, and wouldn't try that.
Looks like your tests show that your LS not being overloaded with reasonable cuts.
What was the Nm rating of your stepper again?
(Being lazy here).
So what happened re finding the right driver tuning software ( u had asked Briney eye).?
Click to expand...
Yes, that is a far more aggressive cut than I would normally make.

The holding torque of my stepper is 4.25 Nm. Remember that I am running a 2:1 gear reduction to the lead screw. Looking at the torque curve, my findings fairly well corresponds to what the curve predicts.

I have not received a reply from StepperOnline about the tuning software as yet. I sent a second request today.
 
RJSakowski said:
Yes, that is a far more aggressive cut than I would normally make.

The holding torque of my stepper is 4.25 Nm. Remember that I am running a 2:1 gear reduction to the lead screw. Looking at the torque curve, my findings fairly well corresponds to what the curve predicts.

I have not received a reply from StepperOnline about the tuning software as yet. I sent a second request today.
Click to expand...
Thanks, um, whats the breakaway torque?
Bit poor of stepperonline, but i Suspect leadshine are holding out.
 
The pull out torque is about 3.3 Nm @ 30 rpm, 23.0@ 150 rpm, 2.5 @ 300 rpm, 1.75@ 450 rpm, and 1.30@ 600 rpm (from their graph).
 
RJSakowski said:
Mostly catching some shuteye. There's a 17 hour time difference.
Click to expand...
Wish I could. 2:40 AM, unknown quantities walking up & down our street, loud voices, continual jabbering eminating from a house up the road. Nervous after theft from car in carport a few weeks ago. Cops said that night was very 'hot' in our street. They oft way too slow to respond. Manpower shortage.bah.
 
The joys of urban life! Our nearest neighbor is a quarter of a mile away and all our neighbors go to bed earlier than we do. We also have very litle traffic on our road, especially after 6PM. It makes for a quiet life.
 
RJSakowski said:
The joys of urban life! Our nearest neighbor is a quarter of a mile away and all our neighbors go to bed earlier than we do. We also have very litle traffic on our road, especially after 6PM. It makes for a quiet life.
Click to expand...
Time to move. . Getting too old for this crap. Jealous!
Anyway nice chatting RJ. Bon Nuit.
 
RJSakowski said:
The joys of urban life! Our nearest neighbor is a quarter of a mile away and all our neighbors go to bed earlier than we do. We also have very litle traffic on our road, especially after 6PM. It makes for a quiet life.
Click to expand...
 
You must log in or register to reply here.
Back
Top