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.
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.
Thanks, I try making a couple and let you know👍
I have a .22 probe made out of peek .. had thousands of shots and its still going strong
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
Sounds like a good idea Stuart 👍
done a few just for experiment sake
kevG
Put one in my FAC two weeks ago, all fine and dandy will see how it goes.
probe_edit_37145951597453.jpg
Looks good and very well made - FAC will show if there's any blow by
Thanks ;)
There isn't blow by @ 140bar.
Looks like it's a good upgrade then 👌
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😂😂.
I use peek probes in all my rapids, used a long time never had any problems with them
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"
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230512_115528_1.jpg)
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230512_115812.jpg)
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..
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230516_125854.jpg)
Turned down the PEEK insert to match the Diameter of the Outer Probe.
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230516_140300.jpg)
Now I cut the 20° taper into the end of the PEEK insert.
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230516_140744.jpg)
So after a bit of sweat... this what I came up with.....
(https://photos.imageevent.com/scl_electronics/gun/ultimaterapid/websize/20230516_141118.jpg)
Time to test now.....
Thanks Guys!!!
(https://photos.imageevent.com/scl_electronics/misc/mages/downapint.gif)(https://photos.imageevent.com/scl_electronics/misc/mages/downapint.gif)(https://photos.imageevent.com/scl_electronics/misc/mages/downapint.gif)
Stuart
nice work that Stuart m8.
kevG
Thanks KevG....
I try.......
:) :) :) :) :) :)
Stuart
That looks great Stuart 👍
Quote from: Daztilley on May 17, 2023, 07:10:43 PMThat looks great Stuart 👍
Thanks..... Like I told KevG..I Try....
But I don't have the Rabid Fox looking over my shoulder...
You know.. the Quality Control person!!!
;D ;D ;D ;D ;D
Stuart
Theres a guy on another forum been making them for ages. I have all mine now in peek.
IMG_20201117_182128672.jpg
Turned a few, they work well.
What is the advantage of these?.
Regards kev.
I am looking for a better seal... with less Lock-up pressure....
I did try this long ago.. but with Delrin(Acetal)
Not as durable as PEEK... It didn't hold up well....
So PEEK has been used many years by the Tuners over here...
Never got around to order some stock to try....
Well these guys on our site MADE me TRY!!!!!!
Time to pressurize the UL_Ti_Mate Rapid...
Let's see how it takes to 70 fpe...
:o :o :o :o :o :o :o
Stuart
kevG and the Rabid fox need a visit.
im sure he will know about this.
Regards kev.
if any one is making these to sell I would like 3 in .177 please guys.
Thought about making one in 177 but there is only 0.8mm in the walls.
Less if sleeving the tip.
I made my .22 inners 3mm instead of 1/8- gains 0.1mm
ah okay mate, thanks for the answer.
Anyone ever investigated cutting a groove in the end of the outer probe and sealing with an o ring. (70 or 90 shore for example)
That way, any leaks that appear over time, just change the o ring?
I am not in any way mechanically minded....my unfinished kit car can attest to that, but seems an inexpensive way to solve the leaking issue when it arises.
Kind Regards,
Rhys
Its been done ;)
Bucketboy machined o-ring grooves in metal probes a few years ago.
Haven't got round to it myself although I have tried o-rings to overcome fine adjustment on an early R7 bolt.
However I do prefer the firmer lockdown with Belvilles, lost count of the times the cocking handle popped out of the gate bumping around the fields at night when I used an o-ring.
there you go.. just a quick trial on a bent outer.
Not a full groove in the face of the outer, imo it would need a 1mm o-ring supported on both sides.
O-ring sits on the inner under the spring, compresses into a radius.
IMG_20230601_160243.jpg
I think he meant a groove & O ring where the outer probe seals on the barrel breach, not to seal the inner probe.
That's an o ring setup on my Rotex Rm8 maybe that's what your trying to achieve.
My FX Dreamline has an o ring inside the brass breach for the probe to seal.
Quote from: angrybear on June 02, 2023, 01:03:23 PMI think he meant a groove & O ring where the outer probe seals on the barrel breach, not to seal the inner probe.
yeah.. crossed my mind after i posted
Quote from: Millingman on June 02, 2023, 09:29:47 PMThat's an o ring setup on my Rotex Rm8 maybe that's what your trying to achieve.
My FX Dreamline has an o ring inside the brass breach for the probe to seal.
like many the probe is also the air feed and goes further into the breech, the Rapid would be limited by the relatively short travel.
never had a problem with the standard theoben or dr bobs probes my self
kevG
I've got a peek probe on my .177 mk1. Dave from Doncaster who used to be on the old forum made it for me about 8 years ago and it's still going strong 👍
Quote from: Squinty on June 01, 2023, 03:05:08 PMthere you go.. just a quick trial on a bent outer.
Not a full groove in the face of the outer, imo it would need a 1mm o-ring supported on both sides.
O-ring sits on the inner under the spring, compresses into a radius.
IMG_20230601_160243.jpg
When using PEEK on valves or pellet probes, if the hole is drilled to the correct size then the peek seals itself against the inner superbly. No orings etc required.