Green Delrin Bar

[lensman57]

Oilon Green bar ordered I will let you know the outcome
Cheers

It is a bitch to machine so make sure that your bits are ultra sharp witha decent radius. The swarf also has a tendency to wrap up around the work piece and the chuck and then solidify so be very careful for god's sake.

A.G

[clarky]

It is a bitch to machine so make sure that your bits are ultra sharp witha decent radius. The swarf also has a tendency to wrap up around the work piece and the chuck and then solidify so be very careful for god's sake.

A.G

Just use a ceramic tip tool. The traingular 3 tips type in a holder. The tips already have the slight radius required as design and you get total sharpness and virtual negative rakes as recomended by Dupont for machining all their plastics. A small top tip fixed asa chip breaker and away you go.
I find 700 rpm works perfect on typical 25mm dia regardless of the correct speed calcs for the diameter.
Same tool and a 1000 rpm with the stainless on moderate feed rates.
I polish the finished stainless with 1000 grade for mirror finish.

[10/10]

Oilon. on its way advice from those that know Which is best. Buttons machined into piston or full seal

[lensman57]

Just use a ceramic tip tool. The traingular 3 tips type in a holder. The tips already have the slight radius required as design and you get total sharpness and virtual negative rakes as recomended by Dupont for machining all their plastics. A small top tip fixed asa chip breaker and away you go.
I find 700 rpm works perfect on typical 25mm dia regardless of the correct speed calcs for the diameter.
Same tool and a 1000 rpm with the stainless on moderate feed rates.
I polish the finished stainless with 1000 grade for mirror finish.

Thanks for the tip mate. never used a Ceramic insert. can I get them for 1/4" or 3/8" shank tools?

A.G

[clarky]

Thanks for the tip mate. never used a Ceramic insert. can I get them for 1/4" or 3/8" shank tools?

A.G

sorry i missed this....yes any ...try Listers.

[ronnie12342003]

how did you get on with machining the green bar then

[10/10]

Firstly thanks for the advice (Used Oilon for O rings) HW 50 177 With JSB pellets
Put gun back together a couple of shots 8.9 FT/LB not great added a 3mm preload washer no real change
Stripped it back down as I removed the piston (a bit snug), so off to The man he machined 4 thou off front O ring 3 thou off rear O ring
reassembled put 5 shots to bed in, the next 10 shots 11.2 FT/LBS Super consistent smooth as silk
Job done
Whilst at the Engineers I had a couple of valve removal tools made up to fit Walther CP3 CO2 + it will probably fit other models.
so 1 is for sale £25 posted please Email me for pics
Thanks to all

[10/10]

The power is now creeping up on the HW50 11.52 consistent hoping it stays there
I will be doing the HW77 next

[xbow]

I've used Ertalyte TX for some jobs and it's brilliant stuff. Similar to Delrin but with PTFE impregnated in it.

https://www.theplasticshop.co.uk/pla...data_sheet.pdf

Not cheap but nice and slippery.