Just machine half the keyway from the top, then flip it over

Neil

No its looking down on the stronger image and the lighter image is in the mirror along with whats on the wall.

The problem with teh picture was it was missing from the post

J

Come on guys…we’ve all done it…
If lucky to one part at a time….
Nice anodising Brian

Thats strange, I'm still seeing my Minnie. I did upload one the other day when somebody had a problem as a test so looks like that has taken over. Will sort it out later as Wednesday night is shed night

J

PS its a bit of my Monitor engine

> I know I should have done it that way.

That was a joke, Brian! I assume you did the grooves that way, just the flip was in the wrong plane..

Neil

It took a moment to see the problem then the penny dropped. Oops! We've all been there. My worst example of self inflicted shame was machining a component incorrectly on the very last cut (of course) forcing me to junk it, making a new one and then repeating the very same mistake. Fortunately my workshop has pretty good sound proofing.

It's the selector ring from Graham's screw cutting dog clutch, the radial grooves should mirror each other, which as the photo shows they do not, the mirror image shows the grooves are 180 degrees apart and the required key way will break into one of the grooves (which is not the main problem but the grooves being 180 degrees out means it is start again time).

Mike

.

John,

I think they must stlll be in the process of migrating to the new server.

… Quite a few images are missing, today.

MichaelG.

No picture here either, just a blank box.

Web-site is flying now so something has worked right….

trevor

Brian

If there is sufficient depth of material between the bore of the wheel and the inside diameter of the "dog groove" to get a key in, you can still use the wheel even though the grooves are cut with 180 deg rotation relative to each other. When the clutch is in operation the gear wheels with the dogs are rotating in opposite direction to each other so the angular relationship between the dogs is constantly changing and a twice the speed that you've got the lathe set at. The crux of the operation of the clutch is that the wheel that you're working on can only engage with the dog gear at one point in it's rotation – your's will still do that. What the gear that you are NOT engaging with is doing is not important. In Graham's design I seem to remember that the shaft key that the wheel slides on is a modified Woodruff key, I think it was shortened, it might be worth seeing how much (if any) of it's height you'd need to remove to get it to operate as a key without blocking the bottom of the groove. If you were to cut the keyway through the land area at the ends of one of the grooves then only one groove would be affected. It might save having to do a full remake unless you really want to.