Steve's dental service for Delrin gears

[EdK]

(05-16-2013, 03:32 PM)stevec Wrote: Thanks all, for the kind words. I'm trying to find a couple of R102RS ball bearings for the layshaft and I'll need some 5/8" shafting. (sob.. no inventory). Then I'll cut the keyway in the shaft and reassemble the geartrain and be back in business.

Steve,

If you've got a Fastenal store close by you can check the store inventory for the bearings online. Otherwise let me know if you can't find any and I'll send you some.

Ed

[stevec]

Ed,
I sent you a PM.

[Bustednuklz]

NICE work!!
At the risk of sounding like a complete rookie(which I am), what is the cutter that you are using to cut the teeth in the new section?

Steve

[stevec]

Steve, It's the same cutter I used to make the gear many years ago,
An involute gear cutter. click this link http://www.kbctools.com/can/Navigation/NavPDF.cfm and type in page 222.

[Mayhem]

So you can get things in NS after all Steve!

[the artfull-codger]

(05-14-2013, 11:28 AM)stevec Wrote: As promised, here's some pics of my `dental work`
Here`s where you normally need anesthetic, I was taking mine orally.



Here`s the implant.



Mounted on a mandrel I turned off the excess.



The spin index set-up might be too flimsy for a metal gear but for plastic it`ll do.
I used the tailstock from my rotab to control movement outward during machining because I had set-up the spin index in the vice and I couldn`t advance the crank to keep the spindle from moving. (there`s always a way....sometimes)



Let`s make sure I`ve got the spacing procedure right for 6° rotation for a 60 tooth gear.



Here we go, new teeth appearing.



Finished dental "Bridge".



There'll prolly be a bit of a thump as the new teeth pass the mating gear compared to the old worn teeth but it should wear-in fairly quickly and at least I'll know where the thump, thump is coming from.

Nice job Steve, I do love repairing otherwise broken stuff,gives you a smug feeling when it's fixed & you didn't have to shell out for a new one[if available] I've repaired a few grandfather clock gears like that but just soldered pieces in & filed to shape.
Graham.

[stevec]

(05-21-2013, 07:28 AM)Mayhem Wrote: So you can get things in NS after all Steve!

"many years ago" I wasn't living here in "the land of you can't get that here".

[stevec]

Just an update, after picking up the bearings I needed over a week ago, I got around to reassembling the lathe.
There is a mild thump as the new teeth mesh through the mating gears in the slower spindle speed that becomes inaudible in the highest speed selection that involves the repaired gear. I'll check to see if it translates as a surface finish aberration with use.
So far so good.

[EdK]

(06-06-2013, 05:30 AM)stevec Wrote: Just an update, after picking up the bearings I needed over a week ago, I got around to reassembling the lathe.
There is a mild thump as the new teeth mesh through the mating gears in the slower spindle speed that becomes inaudible in the highest speed selection that involves the repaired gear. I'll check to see if it translates as a surface finish aberration with use.
So far so good.

Steve,

Good to hear (no pun intended). That was certainly an interesting fix you did to the gear.

Ed