By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Myford VMB

All Topics | Latest Posts

Search for:  in Thread Title in  
Graham Ward07/06/2023 15:12:05
2 forum posts

I’ve just acquired a Myford VMB milling machine that appears to have had very little use. I’ve got it all set up and running nicely. There are still a few little jobs that I need to do but rather than post a list I was wondering if anyone has a manual I could have which would hopefully answer most of my questions.

Moving forward I’d like to be able to run the motor backwards (better for stud removal etc) and have a degree of speed variability if possible. I believe it has the original Brook Compton 0.37kw A/C motor. Any advice would be appreciated.

John Haine07/06/2023 16:53:36
5563 forum posts
322 photos

I have a scanned copy somewhere I could send you. PM me your email address.

Graham Ward07/06/2023 17:05:53
2 forum posts

PM sent, thanks.

Oldiron07/06/2023 17:16:26
1193 forum posts
59 photos
Posted by Graham Ward on 07/06/2023 15:12:0

Moving forward I’d like to be able to run the motor backwards (better for stud removal etc) and have a degree of speed variability if possible. I believe it has the original Brook Compton 0.37kw A/C motor. Any advice would be appreciated.

Add a 3 phase motor and VFD. You get the best of all worlds then.

regards

noel shelley07/06/2023 18:04:21
2308 forum posts
33 photos

Or simply put dewhurst reversing switch on ! simpler and a LOT cheaper.Though no speed control. Noel.

John Haine07/06/2023 20:07:26
5563 forum posts
322 photos

If you look at the wiring diagrams in the manual I just sent you can see the standard motor is capacitor start. You could arrange a switch to swap the connections to the run or start winding to reverse the motor. You can't vary the single phase motor speed.

I have to confess that I rather butchered my mill to fit a used 3-phase 0.75hp Crompton motor. The VMB standard speed changing arrangement is horrible, so I took the stepped intermediate pulley off and fitted it to the new motor shaft (needed a bush to reduce the bore) as it is pretty well the same sizes as the spindle pulley - mounted "upside down" of course. Then use only a single link belt between motor and spindle. 3-phase transforms the machine, much smoother and quieter and much less need to shift the belt. Reverse comes for free with an inverter. The main use case for reverse for me is tapping - set the inverter to a few Hz, bring the tap down to the work, start the spindle, keeping slight pressure on the tap as it cuts and with my finger on the reverse button. When deep enough just reverse the spindle to back the tap out. Haven't broken a tap yet, even once when I forgot to reduce the speed!

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

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
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

 

Donate

donate