printable FSB bench block

[89LT1]

So I am going to reformat an upper for my AR and currently it wears the A2 FSB. I have removed it before but it can be a little bit if a pia. so i was looking around at the bench blocks for them I dont need the block enough to where i would pay for it, but i figure i could print one out.

So here is my design so far:




The block will hold the A2 from either side (installation of pins or removal) and it will allow the use of the lower pins, gas block pin, and the sling pin.



it will fully support the bottom sling tang and the bayonet lug:


and the bridge for the gas block pin:



when the design is finalized i will be posting this on places that host file like this and i will post a link here.

My questions are: who would be interested in this? are there any other functions that this should be able to do? any other features that would be useful to build into this? and any issues with the tool that anyone can see so far?

[6mmintl]

Dont think the blocks will have the strength when you wack at the sight pins.

[89LT1]

Are you familiar with 3d printers?

I can vary the infill and the material from PLA to abs. Printed parts can be strong they just take longer to print. Especially with the surface area of the FSB to distribute the force.

You may be correct but once I have a design I will print and test.

[Exile Machine]

Dont think the blocks will have the strength when you wack at the sight pins.

There are some new polymers available now in filament form that would be plenty strong enough for this application. Bit pricey at the moment but doable. Need an all metal hot end to print 'em as the temp is way higher than (visible) ABS.

-Mark

[kcstott]

The base material has never been the issue with a printed part. It has always been the bond strength.

And FYI I'm very familiar with SLA and 3D printing.

[89LT1]

The base material has never been the issue with a printed part. It has always been the bond strength.

And FYI I'm very familiar with SLA and 3D printing.

Thanks for the thoughts. There are a lot of people who don't know about the printing process and strength since they have not been involved with the product of printing. Input from a user is much appreciated.


I printed one yesterday same basic design as before but I had to trim the fat to make it print faster. I used a 50% infill using PLA. took about 4 hours to print.


I punched the pins in and out already and can barely tell the block was used:

[grymster]

Looks like a pretty good design to me. I'm not a gunsmith, but I would think the surface support areas of your blocks would spread the impacts of driving pins sufficiently to sustain multiple cycles without de-lamination of the base materials.... at least for a while.

[strongpoint]

[89LT1]

Looks like a pretty good design to me. I'm not a gunsmith, but I would think the surface support areas of your blocks would spread the impacts of driving pins sufficiently to sustain multiple cycles without de-lamination of the base materials.... at least for a while.

That is what I was thinking as well.

It will also depend on how the part is printed, as long as the layers are perpendicular to the force applied it should hold up pretty well.

[89LT1]

if anyone wants to make one here is the file location:

http://www.thingiverse.com/thing:1058364

[gemini1]

Thanks for doing this. Showed the link to my nephew and he can do it for me.

[89LT1]

Great!

Let me know how it comes out.

[SVT-40]

Make one for all the pins on a AK barrel... I'll buy a couple!!!

[69Mach1]

Make one for all the pins on a AK barrel... I'll buy a couple!!!

Me too.

Needed for the gas block and front sight.

[SVT-40]

They would be great for the pesky AKSU FSB / GB pins!!!