acetal parts turned lathe work

[dazza]

morning all im looking to get these parts knocked up on a lathe save me buying one i need 100 in black acetal but will likely need more doing there after.
they will need further machineing by me to fit other parts so must be bang on although the overall diameter is not critical just so long as it doesnt fall below a certain size ,i can supply the acetal bar from plastics direct unless you can do it cheaper.
i cant go above £1.25 a prt my price is based on what ive already been quoted to do the full machining of them which was £5 per part all in.

i,ll attatch images of the part both sides but im not sure what format to save it in as a model so i can pin it here to look at
to give a rough idea to size the part is 9mm thick overall and diameter is 38.5mm overall ta
9046
9047

[spluppit]

Is that 1.25 including or excluding material costs?


Kind regards,


Scott

[dazza]

hello scott
thats excluding materials the cheapest place i know of is plastics direct unless who ever wants to do them has the materials in stock i will cover the cost,thanks
ive ordered in sheet to do this originally on my cnc router which would make light work of it but then id have to flip the sheet and i dont fancy that..

[Jonathan]

You could cut them out on the CNC router, remove them from the sheet, then machine the other sides individually if aligning the whole sheet is going to be a problem.

[dazza]

yeah its as much about time as anything else mate,i will probably need a thousand of these disks over the coming months and i must have 20 crappy jobs need doing and they all need doing first.
the call for a lathes getting louder and louder.

[dazza]

are these parts more complicated to lathe than i know?im not up on lathe work,never owned one so if im taking the piss a bit do say ;)

[Swarfing]

Do they have to be acetol or delrin? could they not be a polyurethane plastic? if they can i would have a positive made and use that to make a mold, and then pour the buggers, much cheaper and you can do them yourself.

[irving2008]

Cut from acetal rod a cnc lathe with auto tool changer would make short work of it. there's various ways of approaching it and you say theres other machining to do so really need to understand the finished piece. Looks like the reverse side has a small boss.

one way: a cnc lathe would turn outer diameter, drill inner hole, then bore the recess and part off in 2 steps to do the reverse side boss, then face off for the next part. maybe do 10 off in one run out of 120mm-ish long rod.

[dazza]

one way: a cnc lathe would turn outer diameter, drill inner hole, then bore the recess and part off in 2 steps to do the reverse side boss, then face off for the next part. maybe do 10 off in one run out of 120mm-ish long rod.

Thats exactly how i thought one would go about it,,cant really give too much away but once ive gotten this far with em ive got to run a couple of tool paths on them,using the centre 8mm hole i will bolt these blanks down one at a time and finish..the outer diameter doesnt have to be spot on to size as long as its 38.5mm or greater as it will be machine down with a profile path.

swarfing I wish i could get away with that but there working parts of a 4 or 5 part assembley,they'll get done one way or another thanks.

[dazza]

i thought somebody would have took this on,having slept on it,i will go £140 on these if anyones interested i will pay for the bar needed and have it sent on to you.thanks for looking

[GEOFFREY]

Hi Diesel, will PM you. G.