3dprinting a co-axial bench rest...

[The boogalorian]

Great work. Very interested in this once my to do list shrinks a little.

 

[JGSprecision]

Did some chrono testing (new Athlon chrono) on some 300PRC putting more time on the original rest.
24in barrel + can netted 2830fps avg (2810 box rating), new chrono bracket worked good.

 

[mdftr]

Making progress...

 

[mdftr]

All done! now I just need to persuade you to make an F-Open plate for the top

 

[JGSprecision]

All done! now I just need to persuade you to make an F-Open plate for the top

Stay tuned. Can the bag slide in Fclass or does it have to be stationary?

 

[LVLAaron]

Static. Can't have rollers or move.

 

[JGSprecision]

Static. Can't have rollers or move.

Simple question, simple answer. Can the bag be adjustable ears?

 

[LVLAaron]

Simple question, simple answer. Can the bag be adjustable ears?

It's complicated

https://competitions.nra.org/media/9392/2024-f-class-rulebook.pdf

Page 7 - section 3.1.1

 

[JGSprecision]

It's complicated

https://competitions.nra.org/media/9392/2024-f-class-rulebook.pdf

Page 7 - section 3.1.1

Always. Simply imitate what others are allowed.

 

[urbanrifleman]

View attachment 1647958
Trimmed the extra material out of the linear rails and shortened the legs to fit a 250mm cubed printer. Files coming soon.

What printer do you use?

 

[JGSprecision]

What printer do you use?

Currently using an Anycubic Kobra S1 combo, 270hr in I've had 1 clog that I had to sort out.

 

[JGSprecision]

Not much to update other than I've shot 50 rounds of 338LM off the orginal now.
It sits down under cover on my shooting table and seems to be holding together.
The ARCA clamp doesn't like to stay tight, I feel like its attachment screws need to be the longer pattern. A solution is in the works.
Added 2in stick-on rubber pads (from amazon) but it still likes to move the whole rig under recoil. But this 338LM uses all of my recoil stock travel and the rest is running out of recoil travel as well.
A bag rest is on my todo list, just been wrapped up in summer time construction.

 

[JGSprecision]

I'd definitely say the rod needs to extend thru the weight all the way. Or don't leave it in the hot ish sun for months.
Now that I've sorted thru some gun gremlins that printed bag is climbing the list.

 

[JGSprecision]

Here's a question for those watching-
If I was to do a bag holder, which bag (or bags?) insert fits the "bang for the buck" theme>?
I've been working on some DIY bag inserts but its pretty easy to tie more in materials up than a premade unit costs without adding much value.

 

[JGSprecision]

Made a plate for a basic bag, immediately I see a problem with having so much tilt angle... concerned the bag will "rock"?
Might need to make it adjustable angle without the swivel.

 

[JGSprecision]

Well now it has a hinge and thumb wheel adjuster. It bolts to the orginal acra pivot joint but it does not freely pivot anymore.

 

[itchyTF]

Are the cad file(s) compatible with SolidWorks?

 

[JGSprecision]

Are the cad file(s) compatible with SolidWorks?

Co-axial rifle bench rest, 6 axis by JGSFAB

Has all the features, tilt/rotation X-Y aiming stick with counter balance (lead shot fill), self braking elevation gear drive, leveling feet, etc.Used arca camera clamp, runs smooth. Some hardware required (list work in process) . Pre-release.Fits on 250mm printers, I used PLAplus

www.thingiverse.com

Step (.stp) and Iges (.igs) should be importable. The DWG should be as well but I have not attempted. Its a 3D DWG with solids so maybe not. I use Inventor, SW allows direct import with preserving the part structure. That could be the best option.
Step would be my pick of the current files.

Need to add the latest bag files , I made support parts in the parts and the interface parts where too much surface area. Had to grab supports with pliers and pray.
Need some surface serrations to help separation. But it all fit really well.
Has lots of adjustment for targets uphill or downhill.
This bag is 2.5 x 5.4? Ish foot print, IDK if its common/popular.
The only bag rider rifle I has around growing up was my father's McMillan 50cal bench rest. I just remember the huge mechanical rests (front and rear), it was the late 90s early 2000s , he would go to the Reno fcsa.org shoots with Skip Talbot (RIP). The heavy gun was 50ish lbs , still shooting the "light" gun (30lb). It would be a serious test for this rest.

 

[The boogalorian]

Does anyone here have recommendations for an online class that could teach an ignoramous how to operate a free cad program. I have limited computer skills and have tried to download programs and use the tutorials but always give up because I just spend to much time without any real progress. Any suggestions.

 

[blades]

i remember messing with some early downloadable cad programs, royal pia, and i am not computer illiterate. never did pursue it further, to many other things to accomplish in my limited time available so i am still pushing pencils and twirling compasses which is enough for what i do. The programs do make proof of concept easy though vs mocking something up one way or another.