The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: edboy on 05.08. 2020 23:06

Title: machining clutch plates
Post by: edboy on 05.08. 2020 23:06

hi, anyone have experience of cutting clutch plates on a lathe. cutter used and rpm?

Title: Re: machining clutch plates
Post by: RDfella on 06.08. 2020 14:40

Don't understand the question. Is this parting off clutch discs from a bar of steel?

Title: Re: machining clutch plates
Post by: edboy on 06.08. 2020 23:59

hi rd fella.
i need to take off outer diameter of plain plates and inside diameter of friction ones. tried a cut on my small hobby mill but sparks and blunts.

Title: Re: machining clutch plates
Post by: berger on 07.08. 2020 00:01

I am not a turner but I played with one ages ago while messing with the miss mash of bits I bought for mine. I got brother to sharpen me some HSS tools and set the lathe very slow in back gear. it went well apart from some screaming *help* but I am not a turner I drink black & tans apart from yesterday when I couldn't resist a few theakstons old peculiar ------ like me *beer* *beer*

Title: Re: machining clutch plates
Post by: muskrat on 07.08. 2020 07:03

G'day Ed.
A handy table for cutting speeds https://www.usi.edu/science/engineering/machasst/cutinfo/spd_feed.htm
I'd guesstamate 100ft/min with HSS or 200 with carbide. 0.010" feed per rev.
Cheers

Title: Re: machining clutch plates
Post by: RDfella on 07.08. 2020 10:10

You'll need a carbide tipped tool and quite slow. Being plates are hardish & flimsy, they'll chatter & squeal easily so I'd be down to around 15 - 20rpm (30ft / min) with cutting paste.

Title: Re: machining clutch plates
Post by: ironhead on 07.08. 2020 10:58

Toolpost grinder.

Title: Re: machining clutch plates
Post by: edboy on 07.08. 2020 11:29

thanks for suggestions