Keyway done -- finally!!

[TGTool]

I had a part that required a small keyway, and after a great deal of ancilliary work it's finally there. The keyway was supposed to be 3/32 wide by 3/64 deep so there wasn't a lot of room to work. The cutter itself is a section from the end of a cutoff tool. It's a T-section 3/32 blade so that part was easy. The holder is slotted to take the blade.



It's also recessed fractionally since the thick part of the blade is about .100 and I didn't need that much projecting. The bottom that sits in the slot is also ground at about 3 degrees to provide front clearance. No side clearance in this case. A little would be good, but this worked.

This holder goes in the hand shaper on the QC toolpost.



I don't have infinite stroke, so I made a blind keyway. The cross hole breaks the chips. As usual, getting the tool and setting it up took much longer than the actual cutting. That much was just easy and came out well.



The final part is a step pulley for a 9mm HTD5 timing belt. Not deburred yet, but it looks like it's going to work.

[tattoomike68]

Wow, thats great. You did a good job.

[Vinland]

That looks great!!!!

[BobWarfield]

That sort of thing is always a fussy business. Reminds me to add a slotting attachment for the lathe to my list of To Do's. Inevitably I will find I need it and be tempted to take a shortcut since I don't have one.

I like your approach to the timing pulley as well.

Best,

BW

[Your Old Dog]

Looks like a pretty "up-hill" project but you got thru it anyhow! Nice work coming up with a fix.

[Tinkerer]

Very cool tool and slick looking pulley to boot.

[TGTool]

It has been one of those jobs where you have to go all the way around the block just to get a start. I didn't have a division plate with the right hole count for a couple of the hole sets so had to make that too.

A big THANKS to Marv Klotz for the hole program where you can just put in the number of holes you need and the pitch circle and get a printout of all the X-Y locations. Of course there's that bit about subtracting from 100 and taking out backlash in various quadrants. I guess if I weren't doing that I'd be frittering the time away doing something else like improving my mind (or spelling).

JM

[Ken_Shea]

Jim,
That is nice work and once again proves that there is always more than one road to success. I always enjoy seeing and learning from the varied approaches others take to accomplish an end result.

Take a pic after you get it cleaned up and belt installed so we can see the finished product.

EDIT:
Jim, where did you get the profile for the belt ?


Ken

[TGTool]

Ken,

I've got a catalog from www.econobelt.com which is also Quality Transmission Components. Some dimensions I just scaled from the profile in the catalog. I know the pitch of the belt, and the catalog gives OD figures for different pulleys so I worked out the constants. I can't swear that what I have is perfect but I think it's good. If you're seriously interested in doing some I'll dig out the numbers I used.

[JRouche]

Jan, fantastic....

Looks good and I am sure will de-burr nicely. That would be a good candidate for an abrasive tumbler.


Nice work....JRouche