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Warco WM16 Powerfeed

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Chris Buxton06/09/2019 18:47:50
4 forum posts
2 photos

I've just acquired a Warco WM16 milling machine and wanted a X axis power feed for it.

I came across Mikes workshop **LINK** and liked his approach.

I've beefed up the motor/components to cope with the larger mill.

All the components were purchased off fleabay for around £45.

24v 150rpm gearbox motor 35W peak.. Runs at 11W on fast return on my mill.

24V 3A power supply unit

120X120x90mm Waterproof plastic project box

20A PWM Speed controller Module

Couple of switches

The power supply is adjustable slightly via a pot, so I've set it at 28v . The lead screw is a 2mm pitch and with this motor & gearbox gives 35cm/min fast travel. It slows down to absolute crawl yet still has enough torque to cope. The Power supply is screwed to the wall so the cable to the powerfeed is a safe low voltage.img_20190904_183844.jpg

img_20190904_184642.jpg

David Canham10/09/2019 19:50:45
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45 forum posts
10 photos

Hi Chris,

I am one post above you also with zero input so i thought i'd say hello. Good luck with your model engineering yes

David.

JasonB10/09/2019 19:58:59
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Moderator
16045 forum posts
1684 photos
1 articles

Steve, do you know whet the gear ratio is on the gearhead to give the 150rpm at 24V?

Stuart Bridger10/09/2019 20:41:57
338 forum posts
17 photos

Nice project, inspiring. Especially given the cost of original equipment units.

Ron Laden10/09/2019 20:53:16
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1307 forum posts
224 photos
Posted by JasonB on 10/09/2019 19:58:59:

Steve, do you know whet the gear ratio is on the gearhead to give the 150rpm at 24V?

Jason, If its the motor I think it is (approx 5000 rpm) then 33/1 but dont quote me on that, there are a number of models in this range 12 volt and 24 volt and the spec given is often not that accurate.

Stuart Bridger11/09/2019 10:57:47
338 forum posts
17 photos

Hi Chris, how did you work out how much to "beef up" the original design?
Also having read Mike's article, I did find his rapid/return feed logic a bit difficult to get my ahead around, but i guess it makes sense when you understand it.

John MC11/09/2019 11:54:21
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173 forum posts
24 photos

I've been looking at this design for a power feed for a mill I'm working on. Two reservation, firstly is that there is no means of instantly disengaging the drive to the table. Secondly, electrical stops, how accurate are they? OK for limiting the overall feed. Does the motor stop instantly or is there a finite period of slowing down?

Neither of these are "show stoppers" for me, I'll sort out a lever operated dog clutch. As for reliable/accurate stops I can work around that one, disengage the drive near to where I want to stop the feed and manually feed up to a point on the dial/DRO.

John

Chris Buxton11/09/2019 18:05:47
4 forum posts
2 photos
Posted by Stuart Bridger on 11/09/2019 10:57:47:

Hi Chris, how did you work out how much to "beef up" the original design?
Also having read Mike's article, I did find his rapid/return feed logic a bit difficult to get my ahead around, but i guess it makes sense when you understand it.

The amount of extra beef applied was really in the end... determined by best bang for buck. That 150rpm gearbox motor combo is £20 .. after that the price of them quadruples. 24V power supplies are dirt cheap £7, 20A PWM module £4

I figured the more power the better for torque at very low rpm.

I determined the torque of the smaller and slower 60rpm motor/gearbox used originally by Mike, that apparently struggled a little under some circumstances. And then went bigger until my Yorkshire wallet complained.

Chris Buxton11/09/2019 18:17:23
4 forum posts
2 photos
Posted by John MC on 11/09/2019 11:54:21:

I've been looking at this design for a power feed for a mill I'm working on. Two reservation, firstly is that there is no means of instantly disengaging the drive to the table. Secondly, electrical stops, how accurate are they? OK for limiting the overall feed. Does the motor stop instantly or is there a finite period of slowing down?

I haven't implemented the stops as of yet. On the website link its stated that stop accuracy is 0.01mm, which would be more than accurate enough for me.

The motor does stop instantly at cutting speeds. I may add a panic stop button in the future if I feel the need.

not done it yet11/09/2019 20:52:27
3246 forum posts
11 photos

I would think there would be a difference in stopping time between feed speeds and fast traversing due to the inertia?

Not the same drive, but the table power feed on my Centec 2B certainly doesn’t stop instantaneously. There is likely a programmable brake on the VFD (if I wanted to use it), but the table does not move far at switch off. The important thing is consistency - like how far it takes to stop at the same feed rate and cut. I would think a mechanical trip would be better - my lathe is very reproducible when using the carriage trip.

Question might be as to whether there is a brake on the motor used in this design.

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