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GEP
04-10-2013, 09:30 AM
I am planning to build a fine feed and are looking at worm gears. I am planning to use a 160:1 ratio. What should the pressure angle of the gear be. Looking for suggestions.
Thanks

Jaakko Fagerlund
04-10-2013, 11:22 AM
Whatever you can find and what fits your worm. What is this going in to?

GEP
04-10-2013, 12:11 PM
I have this wanna be mill a HF 42976 that does not have a fine down feed. I realy didnt want to mess with the machine but i had some one that practicly beged me to buy it. I also want to build a CNC out of it.

jmarkwolf
04-10-2013, 12:38 PM
I don't know if it was this same model mill, but I've seen discussion of just such a retrofit either on this or other forums.

Do a Google search and you'll likely find the thread.

GEP
04-10-2013, 04:18 PM
There is a thread on CNCZone that looks interesting but cant get to it for some reason

Paul Alciatore
04-10-2013, 04:57 PM
A fine feed if nice, but I found that a readout (DRO) is a better feature on the vertical feed if precise control is needed. I find I can hit it within 0.0005" with the original lever feed on my Unimat after I added a DI readout. I have also added a readout (caliper) on my full sized mill and it is more useful than the calibrated, fine feed dial.

GEP
04-10-2013, 07:05 PM
Paul
Can i see a photo of your installation

Elninio
04-10-2013, 08:25 PM
I would use planetary gears instead, so you can put it inline with your current dial and have it take up a little space.

this one is 1:10 used in gas powered RC cars:
http://i.imgur.com/fIoLc8C.jpg
http://www.ebay.ca/itm/Traxxas-Planetary-Differential-w-Steel-Ring-Gear-TRA2388X-/400397860206?pt=US_Radio_Control_Control_Line&hash=item5d39927d6e&_uhb=1#ht_3238wt_1163

GEP
04-10-2013, 10:50 PM
How could i turn the gears you recommend 90 degres the worm gear. Would the plastic center with stand the cutter pressure

Paul Alciatore
04-11-2013, 01:17 AM
Paul
Can i see a photo of your installation

Sure. I am not sure which one you wanted so here are both:

http://img.photobucket.com/albums/v55/EPAIII/UnimatQuillDRO_zps80a4097d.jpg

This shows my Unimat readout which is not really digital, but uses a dial indicator.

http://img.photobucket.com/albums/v55/EPAIII/28MountCompleteMediumFileCorrected_zpsce70e0ed.jpg

And this one shows the digital caliper DRO on my Grizzly mill. I never got around to removing the internal measuring jaws on the caliper, but I strongly recommend it as the pointed jaws can be a hazard to your hands.

As I said, both of these make precise downfeeds much easier.

GEP
04-11-2013, 01:36 PM
Thanks Paul

GEP
04-11-2013, 01:38 PM
Just want you to know i am backward my last name Paul

jmarkwolf
04-11-2013, 07:15 PM
I was able to find the thread I was referring to earlier. Maybe it'll be applicable to your machine.

http://www.hobby-machinist.com/showthread.php/1636-Building-a-fine-feed-for-a-small-Hormier-mill-drill-that-didn-t-have-one?highlight=hormier

Paul Alciatore
04-11-2013, 08:57 PM
Just want you to know i am backward my last name Paul

Well, I must be inside out because Paul is my middle name. It started with my grandfather and I do not know the reason. My father was also called Paul. My wife put her foot down and our son goes by the first name, Edward. I guess he is the only straight forward one.

GEP
04-11-2013, 09:42 PM
Eward is a good name as well

GEP
04-11-2013, 09:58 PM
jmark
Thanks for the link. I cant go there Nelson T. dont like me because i hung around with some one he kicked of his site. Besides i think Nelson T needs to be band from the internet with his nasty way of sending messages

jmarkwolf
04-12-2013, 08:26 AM
You can't go there?

Ever?

Too bad. The author did a bang up job of adding fine feed to his bench top mill, with plenty of pics.

GEP
04-12-2013, 09:43 AM
JMark
No I cant go there because a member here that i know for a long long time had a problem with NelsonT NelsonT saw a reply a did on a thread backing that member. Nelson kicked him of first then he came after me. All i did is help, it was over a sale of a mill. I will tell you details check your PM