Green Delrin Bar

[10/10]

Where to get green Delrin for machining into O rings for HW piston or can I buy Delrin O rings
and when looking on You tube it always seems to be green.Why ?

[Artfull-Bodger]

Where to get green Delrin for machining into O rings for HW piston or can I buy Delrin O rings
and when looking on You tube it always seems to be green.Why ?

Delrin is too hard for O rings, most of the seals are made of various grades of Polyurethane, some impregnated and can vary in colour from bright to dark red through white, blue, cream etc.

When you say O rings are you referring to the piston bearing bands?

[10/10]

Ok maybe o ring was the wrong wording it is for machining around the outside of piston for a better fit in the air chamber

[hammy]

Are you thinking of Oilion bar , a self lubricating plastic. It's green.

[Artfull-Bodger]

Ok maybe o ring was the wrong wording it is for machining around the outside of piston for a better fit in the air chamber

Yes that's the Bearing bands, you can buy black or white Delrin bar on E-Bay, in most lengths and diameters.

[10/10]

The word Delrin seems to crop up but open to advice

[10/10]

The word Delrin seems to crop up but open to advice

[tinbum]

The word Delrin seems to crop up but open to advice

Delrin is a trade name like Sellotape or Hoover. People tend to use it when talking about different nylon types.

[lightning22]

https://www.directplastics.co.uk/oilon-rod/

[andrew27473]

Delrin is Dupont's name for acetal h which is a homopolymer don't buy copolymer as it's to soft.

[thisisdonald]

other names to search for are acetal and hdpe (high density poly ethylene)

[Two200's]

Are you thinking of Oilion bar , a self lubricating plastic. It's green.

Tried to make a spring guide from this once - very easy for the tool to leave marks when turning.
The only way I could get it smooth was to really move fast when turning.
It was very odd.

Maybe ok for bearings etc. But a bugger to turn for a guide.

[jdwynn1976]

I'd 2nd 2 200's comments - I found the same - very high speed required to turn smooth - and no noticeable difference from delrin

[jdwynn1976]

I thought the bearing rings were made from PTFE ?

[Artfull-Bodger]

Delrin has good abrasion resistance and rigidity, once installed it's good for many thousand shots, PTFE is a bugger to swell with age and expand with temp, add to which delrin/acetal is easily available and quite cheap.