Gallery, Projects and General > How do I??
Cutting internal gear teeth
bogstandard:
John,
That is definitely a good idea. AFTER the system has been proven to work manually.
--- Quote ---It would only be one step away to fit a windscreen wiper motor fitted with an arm, to push and pull the slotting tool handle, then a ratchet onto the cut feed and you are almost there. But that is getting much too complicated for where I want to be.
--- End quote ---
After a little more brain time I have hit a problem :bang:
The slotting head would have to have total control of the rotation of the ram, with no play allowed at all, and would be a little difficult to do.
However, I do have a few precision linear slides that could do the job for me. I will have to measure them up, to see which would be best size wise.
John
John Stevenson:
--- Quote from: bogstandard on October 07, 2009, 06:43:52 PM ---John,
The slotting head would have to have total control of the rotation of the ram, with no play allowed at all, and would be a little difficult to do.
John
--- End quote ---
I have often wondered why most people follow the same paths ?
Like stepper motor mounting, everyone stands them off on 4 pillars which has to be the most inapt way, was everyone a watchmaker in earlier lives ?
Same with slotting heads, always round rams and bushes and a silly pin to stop rotation, why bushes anyway they don't run at 10,000 rpm.
What about a length of square silver steel in a brass block with vee's machined in and clamp bolts to set preload.
this way the whole of the 4 sides are load bearing AND guide the bar.
1" round bar in a 4" housing has a surface area of 12.56 square inches but a location of minute proportions on the index pin.
A 1" square bar has a surface area of 16 square inches and every one of those locates it.
John S.
andyf:
Yes, I see it all in my mind's eye :coffee: . John S's square ram with an offset mounting on its end for the gear-shaped cutter, leaving some of the end surface exposed when the cutter is in place. To that exposed surface, fit some sort of detent to go between the teeth of the cutter opposite the tooth which is doing the hard work, so the cutter can be rotated, if it is necessary to bring a fresh tooth into play. In effect, the cutter indexes itself. To provide rake and relief, the cutter blank to be dished on the front and slightly tapered in side view. No, that would only help at the tip of the cutter
I'm only posting this because I may want to make an internal gear myself in the not too distant future, so if I'm getting it wrong, please stop me now and prevent :bang:
Andy
NickG:
The slotting attachments I've seen are usually a dovetailed affair akin to the ram on a shaper. Infact, someone from the club gave me just a slotting attachment when I was thinking about making a vertical head for my horizontal milling machine. I think I gave it back when I bought my vertical one though. I don't like keeping things of other peoples if I'm not really going to use them ... somebody else may have given it a good home by now, or it could be sat under his bench still.
Nick
sbwhart:
Ok this is just an idea to get you thinking who knows where it will lead too
When I was using the small arbour press to test out the leather hole punches I looked at it and though square ram, :scratch: if you turned it on its side, clamp it to a verticle slide put the tool at the other end you could use it to shape out internal gear teeth.
Here's a press this one may be a bit big but you can get smaller ones.
http://www.mscjlindustrial.co.uk/CGI/INSRIT?PMRQIT=BIJT3-33710M&origin=VIRTUAL:VIRTUAL_CAT&PMAKA=BIJT3-33710M&returnurl=&partnerURL=http://catalogs.shoplocal.com/jlindustrial/index.aspx%6Fpagename=listpage%50circularid=15737%50storeid=1039181%50uniqueid=%50fsid=%50jsessionid=%50pagenumber=1%50deptid=%50title=%50keyword=press%50returnurl=
Her's a C-0-C of the idea
You may have to cut the press up a bit to get it fitted but they are dirt cheep, I bet you could fix them to a lathe as a key way slotter.
:proj: :proj: :proj: :proj:
Have fun chewing this one
Stew
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