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Hobbing fixture for mill

by dkennell, published

Hobbing fixture for mill by dkennell Mar 14, 2013

Description

Milling teeth for a filament drive gives a better "bite" than hobbing with a tap and ensures that the drive is perfectly round and concentric with the shaft. The fixture allows for 24 perfectly spaced teeth.

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I use a 2.0mm 2 flute carbide end mill.

What type of end mill can be used with this? Does it matter how many flutes the end mill has?

The mill head is vertical, I bring it in from the side to cut. If you are looking at the end of the shaft, the end mill will be at about the 10 o'clock position, and then move horizontally into the shaft to cut.

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Instructions

I used a 2 mm end mill, you could also try a .070" mill for an even closer fit. http://mctinfo.net is a good source for small carbide end mills. I set the z height about 20 degrees above shaft center for a good tooth angle, you could go as high as 45 degrees.

What type of end mill can be used with this? Does it matter how many flutes the end mill has?

I use a 2.0mm 2 flute carbide end mill.

In the instructions you state: "I set the z height about 20 degrees above shaft center for a good tooth angle, you could go as high as 45 degrees." could you clarify what this means? did you center the milling bit over the shaft and then angle the mill head 20degrees? Thanks

The mill head is vertical, I bring it in from the side to cut. If you are looking at the end of the shaft, the end mill will be at about the 10 o'clock position, and then move horizontally into the shaft to cut.

what size end mill do you suggest for 1.75mm filament? Any tips on positioning the mill? I don't have much experience milling

I use a 2 mm end mill.

Thanks. Very nice. I mill M8 bolt for 3mm filament with 3.175mm end mill.

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