Using a mill for slotting

Using a mill for slotting

This topic has 4 replies, 3 voices, and was last updated 18 March 2021 at 12:25 by JasonB.

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18 March 2021 at 11:27 #534599
David Tocher
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@davidtocher94033
I am overhauling a small Gibb boat winch with 75mm drum. I've re-bushed the drum but the ratchet teeth in the drum are badly worn. I thought about how I can deepen the teeth. I'm aiming to cut about 1mm of aluminium, not at one go, and the depth of the teeth/cut is 10mm.

One approach would be to mount a HSS cutter in my SX2.7L mill, lock the spindle and with the drum on a rotary table use the quill to deepen the ratchet teeth. Will this work without imposing an excessive load on the quill?

An alternative would be to mount the RT on the faceplate of my Boxford lathe, lock the spindle and use the carriage to slot.

Comments please!
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18 March 2021 at 11:27 #10750
David Tocher
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@davidtocher94033
18 March 2021 at 11:39 #534605
Brian Wood
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@brianwood45127
David,

You may well find the teeth were hardened in the first place. It might be altogether easier to make a copy in gauge plate, harden and temper that and bolt it on in place Look at the state of the indexing pawl as well, that might even be bent..

Regards Brian

PS The mill would handle the job I think, but it could be noisy and hard work/ expensive on the cutters.
18 March 2021 at 12:24 #534619
David Tocher
Participant
@davidtocher94033
Thanks Brian,

The teeth are aluminium and soft. I planned to broach the teeth vertically with a home-ground square HSS tool. It would be a manual operation using the quill as the ram to shave off metal with repeated strokes. The brass pawls aren't in great shape but I can file them to a better profile.
18 March 2021 at 12:25 #534620
JasonB
Moderator
@jasonb
If it's aluminium as you say it should not be too hard. I've done it on my X3 cutting bronze, if you can feed in so width of cut is always 1mm then adjust depth to what the machine seems happy to cut.. Single HSS tool should do it cheaply enough

Edited By JasonB on 18/03/2021 12:26:42
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