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Electronic Lead Screw Project

The aim of this thread is to detail the build and give help where needed

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Neophyte01/12/2019 16:50:28
8 forum posts

Phil,

Thanks for the board, arrived in the post yesterday. Built and part tested in that last hour. All is well.

For anyone who has not built up and fitted the board yet, do be careful not to allow the bottom of the display header to foul the jumper on the main board.

Keep trying to upload a picture, but not yet found the magic words.

Paul.

Michael Gilligan01/12/2019 22:53:27
avatar
14601 forum posts
634 photos
Posted by Neophyte on 01/12/2019 16:50:28:

[…]

Keep trying to upload a picture, but not yet found the magic words.

.

They are liberally strewn amongst this lot, Phil : **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=103028&p=1

MichaelG.

Phil Grant02/12/2019 09:16:04
80 forum posts
14 photos
Posted by Neophyte on 01/12/2019 16:50:28:

Phil,

Thanks for the board, arrived in the post yesterday. Built and part tested in that last hour. All is well.

For anyone who has not built up and fitted the board yet, do be careful not to allow the bottom of the display header to foul the jumper on the main board.

Keep trying to upload a picture, but not yet found the magic words.

Paul.

Glad it arrived OK.

It may be a good idea to trim the length of the pins that stick through the PCB on the display connector.

insert it onto the PCB and before you solder it use some snips to shorten the pins to just proud of the PCB, I'm sure the holes are plated through so the should still secure properly into the PCB.

For the pictures I would use the album feature in the black bar towards the top of the page then you can insert a picture into a post from the album, as per MichaelGs link.

Phil

Neophyte02/12/2019 09:59:17
8 forum posts

Thanks Phil & MichaelG.

Paul.

Limpet04/12/2019 13:05:21
117 forum posts
3 photos

I've just come across this and think it's brilliant. So far I've watched the first eight of Clough42 videos, more tonight.

Phil I've just pmd you if you still have some boards, ordered my Ti boards from mouse today. Fitting it on a ML7

Are most going for the servo or stepper option

Lionel

Tony Pratt 104/12/2019 14:21:47
959 forum posts
3 photos

I'm fitting one based on Clough42 to a Warco 290V,only problem I've encountered is the Nema 24 stepper motor[s] from 2 suppliers were not as powerful as advertised which is really annoying. Stepper copes fine at 2.5k spindle speed & normal feed rates.

Tony

Roy Vaughn05/12/2019 09:59:03
19 forum posts

Thanks Phil for the TI steer and John for the installation info.

Tony, can you tell us a bit more about your stepper problems and how you resolved them? Are the torque specs not to be believed?

Roy

John Haine05/12/2019 13:25:48
2781 forum posts
140 photos

Tony, when you say 2.5k spindle speed is that stepper RPM? That's a step rate of at least 200 x 2500/60 = 8 khz which is pretty fast for a stepper I think! Torque and therefore power drop off quite quickly with speed. I assume you mean Type 23 stepper? On my CNC Myford the leadscrew motor is a size 38.

Tony Pratt 105/12/2019 16:06:50
959 forum posts
3 photos
Posted by Roy Vaughn on 05/12/2019 09:59:03:

Thanks Phil for the TI steer and John for the installation info.

Tony, can you tell us a bit more about your stepper problems and how you resolved them? Are the torque specs not to be believed?

Roy

I first used a Nema 24 stepper from an Ebay supplier & under a decent cut the motor was not up to the task, on checking the holding torque I got just over half of the advertised 4 Nm, motor was rejected & I got a full refund. I got the 2nd one from a UK supplier also advertised at 4Nm, this was also not giving out a holding torque of the full 4 Nm but useable.

Tony

Tony Pratt 105/12/2019 16:08:32
959 forum posts
3 photos
Posted by John Haine on 05/12/2019 13:25:48:

Tony, when you say 2.5k spindle speed is that stepper RPM? That's a step rate of at least 200 x 2500/60 = 8 khz which is pretty fast for a stepper I think! Torque and therefore power drop off quite quickly with speed. I assume you mean Type 23 stepper? On my CNC Myford the leadscrew motor is a size 38.

No the 2.5k is the lathe spindle speed so the stepper is running a lot slower, I am using a Nema 24 stepper motor which is what Clough42 used.

Tony

Lofty05/12/2019 18:00:15
2 forum posts

Evening all, I successfuly tested my setup today.

Nema 34 closed loop stepper and driver on a Warco 280VF.

just got to figure out an enclure for the key pad a micro board, may put in the head where the existing taco is located.

Testing

Limpet05/12/2019 22:45:42
117 forum posts
3 photos

Well I'm committed now, ordered the Texas board and led key pad today. Tomorrow I'm hoping to find the encodes I squirreled away a couple years ago and see what they are. I'm still undecided whether to use the stepper motor or servo motor and what size for am ML7, is a nema 24 big enough?

Lionel

Tony Pratt 106/12/2019 08:47:58
959 forum posts
3 photos

Based on my Warco WM 290V lathe set up I'm sure a Nema 24 will be plenty big enough for an ML7.

Tony

Rockingdodge06/12/2019 10:19:45
avatar
142 forum posts
29 photos

Yes but what rating? Voltage, Newton's etc, it all has a bearing on suitability wink

blowlamp06/12/2019 11:42:48
avatar
1218 forum posts
82 photos
Posted by Lofty on 05/12/2019 18:00:15:

Evening all, I successfuly tested my setup today.

Nema 34 closed loop stepper and driver on a Warco 280VF.

just got to figure out an enclure for the key pad a micro board, may put in the head where the existing taco is located.

Testing

Plus 1 for the closed loop setup. Definitely the way to go for this kind of application where losing steps will spoil the thread..

Michael Gilligan06/12/2019 13:36:44
avatar
14601 forum posts
634 photos
Posted by Lofty on 05/12/2019 18:00:15:

Evening all, I successfuly tested my setup today.

Nema 34 closed loop stepper and driver on a Warco 280VF.

just got to figure out an enclure for the key pad a micro board, may put in the head where the existing taco is located.

Testing

.

Forgive me please, if I am being dim

... I can’t see any details of the stepper but I do see a hybrid servo driver

Could you please detail what you are actually using.

Many thanks

MichaelG.

blowlamp06/12/2019 13:52:21
avatar
1218 forum posts
82 photos
Posted by Michael Gilligan on 06/12/2019 13:36:44:
Posted by Lofty on 05/12/2019 18:00:15:

Evening all, I successfuly tested my setup today.

Nema 34 closed loop stepper and driver on a Warco 280VF.

just got to figure out an enclure for the key pad a micro board, may put in the head where the existing taco is located.

Testing

.

Forgive me please, if I am being dim

... I can’t see any details of the stepper but I do see a hybrid servo driver

Could you please detail what you are actually using.

Many thanks

MichaelG.

It's probably something like this, although its holding torque may be different.

Still a stepper system, but one with a local feedback loop.

Michael Gilligan06/12/2019 14:06:33
avatar
14601 forum posts
634 photos
Posted by blowlamp on 06/12/2019 13:52:21:

.

It's probably something like this, although its holding torque may be different.

Still a stepper system, but one with a local feedback loop.

.

Thanks for that ... I was blissfully unaware of ‘servo driver’ being used in the context of stepper motors.

MichaelG.

Zan06/12/2019 15:58:59
157 forum posts
12 photos

 

Nema 23 and 24 describes only the frame size and has nothing to do with its holding torque . some 23’s have 4.5 Nm while some 24 have only 1.65nm. So get the full details!

23 has a 56 dia flange, 24 has a 60

 

 Edit..... Another point is that if you use a step down pulley  say 2:1 to increase the torque it’s not that simple.  As the speed of a stepper increases, the fall off in torque is very dramatic, so you gain with the gear ratio, but loose on the motor torque itself! 

Edit 2   Just checked on the jeffree blog mentioned earlier, he used only a 1.8 mm type 23.   With a 40 v drive. I will go for something a little more powerful, a 3 or 4, as rthere is little price difference.

 

Edited By Zan on 06/12/2019 16:08:24

Edited By Zan on 06/12/2019 16:16:31

Tony Pratt 106/12/2019 16:37:31
959 forum posts
3 photos
Posted by Rockingdodge on 06/12/2019 10:19:45:

Yes but what rating? Voltage, Newton's etc, it all has a bearing on suitability wink

I'm not an electronics expert [my son is] but the motor I used was meant to give 4 Nm holding torque.

Tony

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