Pellet probe experiment.

[Millingman]

Have any of you machining guys ever experimented making pellet probes from delrin or the harder plastic peek? I've tried delrin which seals very well onto the breach but doesn't last being a softer plastic. Peek apparently is much harder, more expensive to buy. Just a query.

[Andycoup]

I have a .20 outer probe in peek, I havn't used it yet, but the fella I bought the cal change from said it works extremely well.

[Millingman]

Thanks, I try making a couple and let you know👍

[Therapidman]

I have a .22 probe made out of peek .. had thousands of shots and its still going strong

[Ca_Varminter]

I was just out in my shop...
I was thinking about sleeving the front 1/4" of the outer probe!
I would turning down the outer diameter of the probe
Then press fit a piece of PEEK.
Turn it down and cut the Taper....
But still thinking about it....

Stuart

[Daztilley]

Sounds like a good idea Stuart 👍

[KevG]

done a few just for experiment sake
kevG

[Squinty]

Put one in my FAC two weeks ago, all fine and dandy will see how it goes.

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[Daztilley]

Looks good and very well made - FAC will show if there's any blow by

[Squinty]

Thanks
There isn't blow by @ 140bar.

[Daztilley]

Looks like it's a good upgrade then 👌

[Millingman]

Agreed, looks like this is the way forward and easier to machine than stainless. Polyether ether ketone (peek) can be affected by over heating when machined might need coolant on the lathe but can be annealed etc.
Dr Bob get your lathe man on the job😂😂.

[Dave74]

I use peek probes in all my rapids, used a long time never had any problems with them

[Ca_Varminter]

Well all of you Rabid Rapid members and KevG's Rabid Fox is to blame...
I lock myself into my Shop and fired up my Lathe..
With some 1/4" PEEK stock in hand, I started to cut things!

First turned down the diameter of my .22 outer probe to .188"


I also shorten it by .085"

Then a cut a piece of PEEK rod. Drilled and reamed as needed.
I pressed it on to to my Modified Outer Probe using my tailstock drill..


Turned down the PEEK insert to match the Diameter of the Outer Probe.


Now I cut the 20° taper into the end of the PEEK insert.


So after a bit of sweat... this what I came up with.....


Time to test now.....
Thanks Guys!!!


Stuart

[KevG]

nice work that Stuart m8.
kevG