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Rainmaker 04-18-2019 11:38 AM

That knurling looks awesome, nice work Jon! And thanks for sharing!

JonM 04-18-2019 11:52 AM

Quote:

Originally Posted by Rainmaker (Post 3578318)
That knurling looks awesome, nice work Jon! And thanks for sharing!

Thanks! Creating knurling in Fusion 360 is surprisingly easy. All you really need to do is create a 1 to 2 mm triangular cut coil with one rotation. Take the new faces created by the coil and mirror them on the Z plane. Once you have your mirrored faces, select all of the coil faces and create a circular pattern. Increase the number of copies in the pattern until you get the result you want. Just be sure your computer is up to snuff since this process is very taxing on lower end systems.

Spider! 04-18-2019 12:00 PM

Quote:

Originally Posted by Rainmaker (Post 3578318)
That knurling looks awesome, nice work Jon! And thanks for sharing!

Same, but I guess I would need to see how it feels. I was thinking you can print whatever you want for a knurling pattern, like little Italian Keebler elves. :rolleyes:

I've found you can get away with some less reinforced pump rod anchoring if the action is smooth and you are light on your normal playing stroke. I have some friends that really hammer away on a pump handle and destroy the first weak point (sometimes the hammer lug/body interface). I'm a lot lighter and have a walnut pump handle that is simply threaded with a tap and lives on an open class pump that has seen it's share of paint.

JonM 04-18-2019 12:12 PM

Quote:

Originally Posted by Spider! (Post 3578328)
Same, but I guess I would need to see how it feels. I was thinking you can print whatever you want for a knurling pattern, like little Italian Keebler elves. :rolleyes:

I've found you can get away with some less reinforced pump rod anchoring if the action is smooth and you are light on your normal playing stroke. I have some friends that really hammer away on a pump handle and destroy the first weak point (sometimes the hammer lug/body interface). I'm a lot lighter and have a walnut pump handle that is simply threaded with a tap and lives on an open class pump that has seen it's share of paint.

If you're wearing gloves, the original knurling has really good grip, but I can see how it could feel like a cheese grater after a while if you play with bare hands. The 1 mm knurling is more like the knurling on my new feed plug. It provides a decent grip, but it doesn't dig in as much.

As for the insert vs. no insert deal, my biggest concern with 3D printed threads is that you have to turn and bend the pump rod every time you want to pull the bolt. Over time, I'm thinking that may eat away at the printed threads. I guess this isn't a big deal if you have your own printer, but if someone is printing these for others, I could see where that could potentially be an issue.

JonM 04-19-2019 08:18 AM

I completed version 2 last night. The pump stroke is much smoother now and the knurling is a lot more comfortable to hold. I'm happy to say that this version is done. The next version will have the threaded brass inserts. But, if anyone wants one and they don't care about the insert, this version is ready for printing. The model is available on Thingiverse.

https://i.imgur.com/X9gLMHuh.jpg

NONOBLITUS 04-19-2019 12:01 PM

This is coming out awesome

JonM 04-19-2019 12:17 PM

Quote:

Originally Posted by NONOBLITUS (Post 3578680)
This is coming out awesome

Thanks! I'm having fun with this project too. I'm not looking to make any money off of it either. My goal was to fix the issues with the original PGP2 design and to design parts to keep these old brass guns out on the field. I expect that there are plenty of PGP2s out there that have been sidelined with broken speed feeds and lost feed caps. That's why I'm releasing all of the STL files for free. Anyone with access to a 3D printer can get replacement parts without resorting to eBay or scouring BST posts hoping to find what they need.

blueshifty 04-19-2019 03:21 PM

That knurling printed awesome. Great job. :thumbup:

JonM 04-19-2019 03:36 PM

Quote:

Originally Posted by blueshifty (Post 3578756)
That knurling printed awesome. Great job. :thumbup:

Thanks!

I'm bored at work and I drew up something else just for the fun of it. Now I'm just getting silly. :D

https://i.imgur.com/V8AI4ICm.png

Allerstern 04-19-2019 04:38 PM

Quote:

Originally Posted by JonM (Post 3578758)
Thanks!

I'm bored at work and I drew up something else just for the fun of it. Now I'm just getting silly. :D

https://i.imgur.com/V8AI4ICh.png

I like this....


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