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| madjackghengis:
Hi Chuck, welcome and good luck. I've got a 72 tooth rotary table and I'm quite pleased with it, but you don't have to buy an expensive gear to make one. You can use the method of dropping verticals to set up a blank round piece for an index plate with seventy two holes, make a cutter for a flycutter, to cut the teeth, and make your own gear. Take a piece of light card stock such as a shirt box, make a strip which precisely fits around the outside of your blank, the larger the easier and more accurate spacing, lay this strip down on a flat work table you can put pin pricks in without causing a war with the wife, take a yard stick or longer measuring device that is longer than the strip, figure out which marks you can count out seventy two of, and have the end of the yard stick on one end of the strip, and the seventy secondth mark vertically in line using a square, with the other end of the strip, with both the strip and the yard stick well attached to the work table, use a straight edge under the strip, a square setting on the straight edge, and move it to line up with the chosen mark on the yard stick which should be at an angle to the strip, and draw a line down perpendicular to the strip, ending up with seventy one lines, and the two ends connected together being the seventy second line. This secured to the blank will allow you to index the blank, and drill indexing holes for positive stops to cut the teeth. Choose a gear pitch that meets your size expectations before laying this all out, and then you can use the gear tooth profiles in any good gear book or machinery's handbook, and grind a bit to match what is shown, which will cut well if carefully done. The blank its self can be drilled, a temporary angle plate jig set up, with a pin to match the hole circle, and the teeth cut on the blank. If you set the angle plate at the pitch angle of the worm you intend to use, chosen to match the pitch of the gear, the worm can be perpendicular to the gear, otherwise it will have to be set up at that pitch angle, to get it to interface with the gear. It is worth the trouble to get the worm perpendicular, usually. I just used this method, essentially, to make a replacement gear of fifty one teeth for a machine which wore all the teeth off its worm gear. You can use a large round piece of plywood for a temporary table for your drill press, and thus have the spacing of the dropped marks wider, and easier to make accurately, with the blank attached to the wood and drilled after you attach the strip to the plywood. I'd be happy to answer any questions regarding this, although I believe there is at least one place in this website where this has been demonstrated. :thumbup: mad jack |
| Dean W:
--- Quote from: andyf on May 17, 2010, 04:45:36 AM --- --- Quote from: Dean W on May 16, 2010, 09:25:14 PM --- If your photos are in Photobucket, you don't have to do anything but copy and past. You don't need to use the IMG tags, as Pbucket puts them in automatically. Check it out: --- End quote --- Thanks for the correction, Dean :thumbup: . I was getting mixed up with inserting pics in posts to Yahoo groups. Andy --- End quote --- Oh! Andy, I didn't mean to be "correctional". All these forums seem to use different software to decide how they want pictures. It's confusing! Regards, Dean |
| andyf:
--- Quote from: Dean W on May 17, 2010, 05:17:39 PM ---Oh! Andy, I didn't mean to be "correctional". All these forums seem to use different software to decide how they want pictures. It's confusing! Regards, Dean --- End quote --- No worries, Dean - my post was a bit misleading, and needed correcting - as you rightly pointed out, I was overcomplicating the process. Chuck, it's time you tried out a pic or two! Andy |
| Chuck in E. TN:
O.K. Here's the pic's so far. The Collected materials: I got the origional 4" round split again: This is the worm set I started with. Also shown are the axil for the rotating part and the bearings that will be used. I cut a piece off the treadmill elevation screw, bored it to fit an axil that would also fit a skate bearing. Worm on the axil: The worm gear shown is an 80 tooth change gear from my lathe. I may go with a 60 tooth change gear, or develope a method of using either? Photo bucket does make it easier when you figure it out! |
| Chuck in E. TN:
I am having problems turning the copy of my lathe’s spindle nose. I’m getting heavy chatter, digging in and even stalling the lathe. I made a rookie mistake by not asking the machine shop I got the piece from, what material it was. I have reground bits, honed and reground the HHS bits again. I have tightened all the cross slide and compound gibs. The cross slide and compound have been lapped. I am currently turning it at 300-320 rpm, and chips are short, curly, hot and blue. I’m wondering if I need to invest in an indexable carbide tool set for this piece. Any suggestions? Chuck in E. TN |
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