Simple(?) Milling Question

[Chris VParticipant @chrisv]

Ok great, thanks very much all, I will give it a go!

Cheers

Chris.

[not done it yetParticipant @notdoneityet]

One suggestion, if the part is not yet sized to length, is maybe cut a blind slot, then machine off the end to open the slot?

[Nigel Graham 2Participant @nigelgraham2]

I am sure your right, Martin, from a purely functional angle, but may as well try to get it as near-enough perfect as possible! I use lathe tools as parallels at times though I believe it's not recommended.

One way to support a work-piece like this under the cut itself, is to use a piece of BMS or aluminium bar as a sacrificial parallel.

Chain-drilling the worst out… Having used a heck of a lot of chain-drilling to chew a two-throw crankshaft out of a foot-long piece of what had been a scrapped railway-wagon axle, I would avoid it as far as possible. Even with filing the worst of the "teeth" down it still presents a lot of horrible, irregular lumps and bumps to the cutter and could even cause it to jam.

On the crankshaft I was using a ripping-cutter along the open, drilled faces; but for cutting a small slot such as on Chris' knurling-tool, or a clevis, I would rather let the cutter do all the work, as then it is fully and smoothly supported through the cut.

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