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  • Fine Feed

    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

  • #2
    Whatever you can find and what fits your worm. What is this going in to?
    Amount of experience is in direct proportion to the value of broken equipment.

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    • #3
      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.

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      • #4
        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.

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        • #5
          There is a thread on CNCZone that looks interesting but cant get to it for some reason

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          • #6
            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.
            Paul A.
            SE Texas

            Make it fit.
            You can't win and there IS a penalty for trying!

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            • #7
              Paul
              Can i see a photo of your installation

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              • #8
                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://www.ebay.ca/itm/Traxxas-Plane...ht_3238wt_1163
                Last edited by Elninio; 04-10-2013, 08:28 PM.

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                • #9
                  How could i turn the gears you recommend 90 degres the worm gear. Would the plastic center with stand the cutter pressure

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                  • #10
                    Originally posted by GEP View Post
                    Paul
                    Can i see a photo of your installation
                    Sure. I am not sure which one you wanted so here are both:



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



                    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.
                    Last edited by Paul Alciatore; 04-11-2013, 01:19 AM.
                    Paul A.
                    SE Texas

                    Make it fit.
                    You can't win and there IS a penalty for trying!

                    Comment


                    • #11
                      Thanks Paul

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                      • #12
                        Just want you to know i am backward my last name Paul

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                        • #13
                          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/showt...hlight=hormier

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                          • #14
                            Originally posted by GEP View Post
                            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.
                            Paul A.
                            SE Texas

                            Make it fit.
                            You can't win and there IS a penalty for trying!

                            Comment


                            • #15
                              Eward is a good name as well

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