Module Gear Cutter Arbor

[rossbotics]

I made this arbor for holding a #3 - 1.5 Module gear cutter. Seams as someone on 2nd shift at work wanted to play with the lathe and jammed the carriage of the lathe all the way against the headstock and stripped the power feed gear.
It's a chineez lathe so getting replacement parts was just totally out of the question.
So my boss asked if I could make one at my shop. I told him it wasn't a problem. I told him what cutter to order and the bronze I needed and I would make an arbor for the cutter. I also had him order me a 17 tooth #20 chain sprocket for indexing purposes.

The indexing fixture I used is one I made along time ago, way before I new about homemade tools. It's constructed from a piece of 1.500 X 2.500 X 3.500 aluminum stock with an indexing pin mounted to the side of the block, It accepts a piece of 3/4" round stock as the arbor ,The 3/4" arbor is machined on both ends one end to accept a gear blank and the other to accept a gear or sprocket for indexing, It's a very simple devise but works beautifull.

Below are some photos


As always thanks for looking
And happy Machining

Doug

Click here to purchase a set of these plans http://www.homemadetools.net/forum/m...or-plans-46305




End View



How I indexed the teeth



Fixture tilted at a 4 degree angle to match the lead of worm gear








Finished Product

Click here to purchase a set of these plans http://www.homemadetools.net/forum/m...or-plans-46305

[Jerrdan john]

That's working with what you have for sure. Thankfully I have an indexing head, but using the sprocket was a neat trick.

[Paul Jones]

Doug,
Creative use of a chainsaw sprocket gear. I like seeing another way to index for 17 steps when we don't have the correct index plate to do this. The indexing technique has many uses in general. Based on what I have read, I think a lot of the import geared-head lathes come with 17 tooth bronze power feed gears and here is a way for replacing highly worn or damaged gears.
Thank you for the photos and description.
Paul

[PJs]

Thanks Doug. Beautiful finish on the gear cutter arbor. I didn't see any keyway or maybe a set screw for the cutter to lock on, on your drawing, but the last pic almost looks like something is there about 10 O'clock? The indexer is quite brilliant and perfect for a homebuilt project. Like Paul said the 17T sprocket is creative! Also curious about the 3/4" arbor for the indexer...if it's tapered and why the nut? Looks like you made short work of a problem that could have been a nightmare!! Thanks for Sharing your fine work! ~PJ

[rossbotics]

Thanks everyone for the compliment, as to your question PJs about the arbor ? It is straight piece of CRS , it is turned down to 5/8" on the end that holds the gear blank, and turned down to 5/8" on the other that holds the sprocket, there is no key or any other driving method to drive the gear cutter it's secured by the thick washer and the 5/16" socket head cap screw, the rotation of the cutter will actually have a tendency to tighten itself, I didn't see a need for a key or anything, depth of cut was only .133" and it was bronze, nota problem

Thank You

Doug

[kbalch]

Thanks Doug! I've added your Module Gear Cutter Arbor to our Lathe Accessories category, as well as to your builder page: rossbotics' Homemade Tools. Your receipt:

Module Gear Cutter Arbor by rossbotics

tags: lathe, arbor, gears, sprocket, cutter

[Altair]

Nifty indexing setup you've got there Doug. Great idea on the sprocket btw. Reminds me of sewing machine pattern discs.

Al

[Paul Jones]

Doug,

I like your indexer design and bought your plans for the arbor and the indexer. I have a geared-head lathe built in Taiwan in the late 1980's and I may have to create a new power feed gear one of these days. It is a nicely made lathe with NSK tapered roller bearings and so far no measurable TIR in the spindle so I want to keep in in good shape. Thanks for publishing the plans.

Paul

[DIYer]

Thanks rossbotics! We've added your Indexing Fixture to our Measuring and Marking category,
as well as to your builder page: rossbotics's Homemade Tools. Your receipt:

Indexing Fixture by rossbotics

tags: indexing unit