Author Topic: PP750 Artemis Tear Down and Tune Up (Read 35254 times))

Thane · « **Reply #40 on:** July 16, 2020, 04:55:25 PM »

The grip scale material I used is stabilized wood and resin, bookmatched blanks sourced from Etsy.

Minimum blank dimension is 5" x 1 3/4" x 1/4" for OEM sized scale. To get out around the trigger with beefier section 5 1/2" x 2" x 3/8" (what I used, I've got big mitts)

Use thin 2 sided tape to join scale, exposed faces out, orientation of handle.

Remove right handle cover to use as template to trace LEFT (flat to flat) profile and drill points for fasteners through both scales. Use smaller drill, careful not to strip cover threads.

With blanks still bonded together cut and true profile, sand contours, chamfers... both left and right together. I use a 12" disc sander and 1" drum sander in drill press for undercuts, shaping finger and thumb rests. Resist making knife thin sections, they will break. Definitely wear a dust mask, who the héll knows what the etsy crowd used for dye/resin, you just don't need any of it in your lungs.

Separate and do some test fits on gun, feel for hand fit, finger and thumb shelve... what ever your working toward. Tape them back together and keep shaping until your happy with hand fit.

Break out the sand paper and hand sand until smooth. 220, 400, 600, 800, 1000, 1200

Separate scales and drill after sanding complete, this keeps bored edges from rounding, for correct hole size and countersink/counterbore to match hardware. I went with hex head countersink to keep more material under the head.

Then polish for resin, seal for wood. I took it to a satin finish and waxed it.

B.Guns. · « **Reply #41 on:** July 17, 2020, 08:45:20 AM »

Thanks Thane. I’m going to try it when mine arrives.

Thane · « **Reply #42 on:** July 17, 2020, 09:08:36 PM »

Time for a cheek riser, bars are low and cold.

Drilled some high density polyethylene with a #1 bit (0.228") slightly under bar diameter 0.235" then wallowed it a bit left and right to maintain a friction fit. Bonded some EVA foam, shaped to correct height, can be rotated 180° for higher comb.

Works better than I expected as it greatly reduces the twisting and flex in retracting stock to an abso. Really wish I had done this first when added 2nd shorter stock index.

Bunyboyz · « **Reply #43 on:** July 18, 2020, 10:38:00 AM »

I’m keen to order one of these from Krale shop soon. Very nice work. I’ve bookmarked and kept some photos from this page.

Do they also make a .25 or wastgat a different model. I really think .22 would cover my purposes

Thane · « **Reply #44 on:** August 03, 2020, 07:22:08 PM »

Quote from: Bunyboyz on July 18, 2020, 10:38:00 AM

I’m keen to order one of these from Krale shop soon. Very nice work. I’ve bookmarked and kept some photos from this page.

Do they also make a .25 or wastgat a different model. I really think .22 would cover my purposes

.177 and .22 available, waiting on a second PP750 in .22.

Thane · « **Reply #45 on:** August 03, 2020, 07:52:30 PM »

To further reduce binding when cocking the PP750 I turned a tapered undercut (±15°) onto the hammer collar face and bolt head. Theses surface now dovetail together and do not allow the bolt to slide up on the hammer face edge.

With the dovetail cuts, bolt shim, some moly on thick section of probe... no binding for 200 or more pellets.

My PP750 was an early build and more recent builds may not experience binding, but if you do save your lever and take some action.

SILENT SQUIRREL · « **Reply #46 on:** August 03, 2020, 08:53:13 PM »

Quote from: Thane on August 03, 2020, 07:52:30 PM

To further reduce binding when cocking the PP750 I turned a tapered undercut (±15°) onto the hammer collar face and bolt head. Theses surface now dovetail together and do not allow the bolt to slide up on the hammer face edge.

With the dovetail cuts, bolt shim, some moly on thick section of probe... no binding for 200 or more pellets.

My PP750 was an early build and more recent builds may not experience binding, but if you do save your lever and take some action.

Nicely done!

Madd Hatter · « **Reply #47 on:** August 04, 2020, 11:17:43 AM »

Thane son of Thanos,😁 been following this thread. Good work there guy. Looking to get one of these myself eventually.

Thane · « **Reply #48 on:** August 04, 2020, 01:49:18 PM »

Thanks, it is a fun pistol to work on.

Madd Hatter · « **Reply #49 on:** August 04, 2020, 02:54:22 PM »

Have you worked on the PP 700? Kinda wondering which can be made more powerful.

Nomadic Pirate · « **Reply #50 on:** August 04, 2020, 03:24:25 PM »

Still would like this handgun if it can be made un-regulated and approaching 20 FPE

Thane · « **Reply #51 on:** August 04, 2020, 04:44:02 PM »

Quote from: Madd Hatter on August 04, 2020, 02:54:22 PM

Have you worked on the PP 700? Kinda wondering which can be made more powerful.

PP700 is one of my favorite guns, and others have pulled really high FPE out of. Like most I look for a balanced tune, finding what the gun feels comfortable to shoot at and where the sweet spot is for power/speed/accuracy/sound.

Common sense aside, the highest usable tune from my PP700 was 12FPE for 25 shots and best tune of 11FPE for 36 shots not so quiet. PP750 highest, regulator stack removed 16FPE at 2400psi with an 8.4 gr pellet, not at full pressure due to oring pressing out. Best PP750 balanced string 13 FPE for 28 shots 8.4 gr and very quiet.

I have little doubt someone will pull the washer stack, seal the air tube (it's open to allow the regulator to balance), slug the hammer with a brass core and make a Korean cliff starting over 20FPE and make a very loud sound come out of the 8" barrel.

Madd Hatter · « **Reply #52 on:** August 05, 2020, 12:35:54 AM »

Thanks Thane. I'm still up in the air on which one to get. I like the seemingly simpler design of the 700 but also like the repeating ablitys of the 750. Well, I've got lots of time to think on it and info to read.

Nomadic Pirate · « **Reply #53 on:** August 05, 2020, 02:34:56 AM »

Quote from: Thane on August 04, 2020, 04:44:02 PM

Quote from: Madd Hatter on August 04, 2020, 02:54:22 PM
Have you worked on the PP 700? Kinda wondering which can be made more powerful.

I have little doubt someone will pull the washer stack, seal the air tube (it's open to allow the regulator to balance), slug the hammer with a brass core and make a Korean cliff starting over 20FPE and make a very loud sound come out of the 8" barrel.

Perfect, that's exactly the way I like it

....1st shot the most powerful !!

Warburrito · « **Reply #54 on:** August 24, 2020, 08:20:37 AM »

Mine hasn't arrived yet (sent to Brian for tuning), but I like the idea of crafting a cheek riser/rest. Maybe even making one that can fold out of the way so it can still be collapsed. Do you have calipers to measure the diameter and distance between the rods for the shoulder stock? I'd like to start designing one now if possible.

bear air · « **Reply #55 on:** August 24, 2020, 08:36:45 AM »

Someone chimed in on the PP750 thread on AGN and stated he had seen where someone converted theirs to use a buffer tube and stock. That would be pretty cool specially if a guy could use a folding stock adapter. Such a neat little gun, I'm waiting on mine to come from Brian as well. The same guy posted a shot group at 25 yards with CPHP's the size of a dime! That's great news for me since I have a bunch of those pellets, like 11,000 bunch!

Thane · « **Reply #56 on:** August 28, 2020, 07:46:20 PM »

Today the PP750 in .22 arrived from Wes!

Looks great, comes with USA brass valve seat.

First 5 shots with JSB .22 Heavy 18.13 gr made 450 FPS about 8.2 FPE... the starting point.

bear air · « **Reply #57 on:** August 28, 2020, 08:28:33 PM »

Did yours go to Veradium? Try shooting some CPHP's.

Thane · « **Reply #58 on:** August 28, 2020, 09:14:51 PM »

Straight to me.

I have some work to due to baseline it. Then it begins...

SILENT SQUIRREL · « **Reply #59 on:** August 28, 2020, 10:08:56 PM »

Quote from: Thane on August 28, 2020, 09:14:51 PM

Straight to me.

I have some work to due to baseline it. Then it begins...

After you have determined it will you please post the baseline info, Thane?
It would be most helpful.
Especially as a comparison for those of us that are having Veradium perform the tune.
Thanks
Ed

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PP750 Artemis Tear Down and Tune Up

Author Topic: PP750 Artemis Tear Down and Tune Up (Read 35254 times))

Nomadic Pirate

Nomadic Pirate