FX impact PEEK regulator piston

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weatherby

weatherby

Member
Jun 5, 2015
602
71
--, Belgium
When your Impact parts are already spread out over a square meter on the kitchen table.......

I thought, why not make a PEEK regulator piston right away? :)

This was a challenge, making a 7mm x 16mm part on a 800 kilogram lathe and a 300kg milling machine.... the vent hole is 1mm diameter to give you a idea of the size.

Good news, it even works too :p

Not that the original Delrin one isn't good, but I had to try it out. PEEK is harder and stronger, but I had to find out if it is able to seal as well.



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Nice.. I love PEEK, but it's tough to work with. You can't really "polish" it like you can with some POM materials. I'm finding that it is more like aluminum on my lathe than acetal polymers. The sharper the tool the better lol
Click to expand...

Oww, my experiences are the exact opposite :D

It was actually very easy to machine, and I haven't actually polished it at all, it came out as it is showing on the pics :)

I use a DCMT7 polished carbide cutter for aluminum, and it works like a charm!. 
 
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And peek easily polishes to a very smooth finish with 500-1500grit wet dry sand paper. For me and my limited tool set, it is more forgiving than delrin, etc....Delrin will "fuzz" , peek will not....
Click to expand...

It depends on the type of PEEK. The super wear resistant stuff that I've used recently (Ketron) doesn't buff smooth at all. I can't even shape it with 120 grit when I turn it fast on my lathe. I think the OP is using something like the more slippery PVX / TecaPEEK.

Nice but I understand that peek seals at much higher pressures than Delrin.

Let's see.
Click to expand...

Yeah a couple of my Taipan valves do not seal well under 125bar. The material has no "give" to it, so they leak slowly. The material is very strong though.
 
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And peek easily polishes to a very smooth finish with 500-1500grit wet dry sand paper. For me and my limited tool set, it is more forgiving than delrin, etc....Delrin will "fuzz" , peek will not....
Click to expand...

It depends on the type of PEEK. The super wear resistant stuff that I've used recently (Ketron) doesn't buff smooth at all. I can't even shape it with 120 grit when I turn it fast on my lathe. I think the OP is using something like the more slippery PVX / TecaPEEK.

Nice but I understand that peek seals at much higher pressures than Delrin.

Let's see.
Click to expand...

Yeah a couple of my Taipan valves do not seal well under 125bar. The material has no "give" to it, so they leak slowly. The material is very strong though.
Click to expand...

I believe you, there are differen sorts of PEEK. When you have the glassfiber filled version, you might get into trouble while machining.

I have used the unfilled natural version. It is very easy to work with, and I assume also better suited for sealing purposes :)



Thanks for the compliments guys, this one went well, just felt the need to try it.

It works a charm, no creep at all, and it seems to be very stable. Will see how it will turn out over time. 
 
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