By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Warco GH Universal mill help

Attempted power lift for the head

All Topics | Latest Posts

Search for:  in Thread Title in  

Rockingdodge22/09/2021 19:12:20
avatar
288 forum posts
53 photos

I've recently acquired a Warco GH Universal mill and it's a great mill but the method for raising the head is rather laborious and long winded!!! I tried a 3nm stepper motor but it couldn't touch it, so I then tried my 18v drill and it did move it once fully up and down but now the ratchet in drill mode has kicked in and no longer works.

Has anyone done this 'upgrade' or got any suggestions?

Cheers

Roger

Ian McVickers22/09/2021 19:29:27
213 forum posts
109 photos

I did it to mine when I had it. Used a high voltage 12nm stepper through a worm gearbox. Used a little cheap controller from ebay for up/down and speed control signals to the stepper driver. Worked really well and was far easier than cranking that handle.

elanman22/09/2021 19:34:59
38 forum posts
3 photos

The first thing I'd do would be to measure how much torque is required to move it with the aid of a lever and spring balance. Then I'd look at what options there are to achive this torque. What size gear box might be needed in order to use a smaller motor? Then it might depend on how much you want to spend.

Cheers

John

Bazyle22/09/2021 20:10:53
avatar
6038 forum posts
220 photos

Counterbalance might help. Unless you need to use a stepper for a cnc application it is a terribly inefficient motor for this application. A traditional solution would be a windscreen wiper with as much reduction gearing as needed. Also perhaps a mobility scooter motor which seem to crop up a lot. Problem then is big enough PSU.

not done it yet22/09/2021 21:13:48
6322 forum posts
20 photos
Posted by Bazyle on 22/09/2021 20:10:53:

Counterbalance might help. Unless you need to use a stepper for a cnc application it is a terribly inefficient motor for this application. A traditional solution would be a windscreen wiper with as much reduction gearing as needed. Also perhaps a mobility scooter motor which seem to crop up a lot. Problem then is big enough PSU.

I like Bazyle’s suggestions.  No real problem with PSU - drive the buggy motor from a (smaller than the buggy required!) battery and recharge with a trickle/float charger?

Maybe a small three phase motor with a VFD though a suitable gearbox, as a further possibility?

The counterbalance, if possible, is certainly the key to the power required.

Edited By not done it yet on 22/09/2021 21:19:49

Rockingdodge22/09/2021 22:44:58
avatar
288 forum posts
53 photos
Posted by not done it yet on 22/09/2021 21:13:48:
Posted by Bazyle on 22/09/2021 20:10:53:

Counterbalance might help. Unless you need to use a stepper for a cnc application it is a terribly inefficient motor for this application. A traditional solution would be a windscreen wiper with as much reduction gearing as needed. Also perhaps a mobility scooter motor which seem to crop up a lot. Problem then is big enough PSU.

I like Bazyle’s suggestions. No real problem with PSU - drive the buggy motor from a (smaller than the buggy required!) battery and recharge with a trickle/float charger?

Maybe a small three phase motor with a VFD though a suitable gearbox, as a further possibility?

The counterbalance, if possible, is certainly the key to the power required.

Edited By not done it yet on 22/09/2021 21:19:49

There's no easy way for a counter balance and I think it would need to offset about a 100kgs to work. I don't need variable speed just need it to go up and down at a suitable rate, I have a couple of leisure batteries left over from my touring days so a buggy motor would be worth looking into.

Ady122/09/2021 22:59:44
avatar
4728 forum posts
714 photos

I use portable drills all the time as power feeds, very useful

not done it yet23/09/2021 07:57:07
6322 forum posts
20 photos
Posted by Rockingdodge on 22/09/2021 22:44:58:

There's no easy way for a counter balance and I think it would need to offset about a 100kgs to work. I don't need variable speed just need it to go up and down at a suitable rate, I have a couple of leisure batteries left over from my touring days so a buggy motor would be worth looking into.

Even if not “an easy way”, counterbalancing must reduce the load required. Machine only weighs 320kg, so I doubt it needs 100kg offsetting - the head still needs some downwards force. Any reduction in effective weight will make a difference.

The common ‘assisters’ are pneumatic struts similar to the boot and bonnet props in many modern cars.

HOWARDT23/09/2021 09:18:36
778 forum posts
28 photos

I also have a GH Universal and have looked at the same problem. The motorised version uses a 120W geared motor driving the screw from the top of the column. Not sure what the ratio is on the gearbox but various versions are available on Amazon. When I designed vertical slides they where mostly balanced by a hydraulic cylinder fixed directly to the slide but these catered for full safety on failure, so in our case a gas strut would be ok. One day I will get round to doing it but at the moment I can live with the handle.

Rockingdodge23/09/2021 09:35:17
avatar
288 forum posts
53 photos

The mill actually weighs in at 360kgs and the head is the heaviest part of the mill so while it's an estimate I don't think I'm that far off. If the mill had a rack for the head I would go with a counterbalance but it has a screw in the column and takes 3 1/2 turns of the handle to move 10 mm! The effort to move the head down is appreciable while not as much as going up.

A freshly charge battery in my drill will move the head up but is on the cusp of the ratchet triggering to avoid motor burnout etc.

I think I'll look for a mobility motor or similar and build on from there, meanwhile I'll use the cordless drill as I have 3 batteries so always have fresh ones available.

Cheers

Roger

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
cowells
BOLDON
rapid Direct
JD Metals
Eccentric July 5 2018
walker midge
Warco
emcomachinetools
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest