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UHMW test rounds

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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UHMW test rounds

Unread postAuthor: jagerbond » Sun May 17, 2009 7:54 am

We made these today for testing purposes. Each weighs in at 85 grams and initial results are quite impressive. We were able to puncture 2" holes in steel roofing material. Check out the photos with 1/2" diameter steel insert easily cutting 1/8" plate steel and 3/16 HDPE 5 gal bucket. We were able to reuse these rounds until lost! We will be posting these on the web site shortly.

Note all rounds fired from BL-520

Damage videos to follow.

Mike
Sureshot / http://www.ultimatespudgun.com
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DSCF0154.JPG
2" UHMW round weighed 85 grams
DSCF0156.JPG
1/8" plate steel
DSCF0155.JPG
3/16" HDPE 5 gal
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Unread postAuthor: far_cry » Sun May 17, 2009 8:03 am

wow thats evil :twisted: :twisted:

what are they made from .Teflon? ore something else
BL-520 is a beast

and this cost you a lot :wink:
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Unread postAuthor: jagerbond » Sun May 17, 2009 8:09 am

far_cry wrote:wow thats evil :twisted: :twisted:

what are they made from .Teflon? ore something else
BL-520 is a beast

and this cost you a lot :wink:


UHMW http://en.wikipedia.org/wiki/Ultra_high_molecular_weight_polyethylene

We will be retailing these for $4 a piece. They are nearly indestructible, so if you have a suitable back stop you can re-use. We started with 3 and we're shooting at night and got 20 shots off before we lost them.

Mike
Sureshot / http://www.ultimatespudgun.com
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Unread postAuthor: Ragnarok » Sun May 17, 2009 8:13 am

Oh dear, Far_cry...

far_cry wrote:What are they made from? Teflon? Or something else?

You know, this is just a wild guess, but I think they might be made from UHMW (Or Ultra High Molecular Weight polyethylene, if you prefer)

...like it says in the topic title?

And what's the cannon you shoot with? It must be high pressure air !!

He told you that too, the BL-520. It's one of the combustion cannons he sells on his site.

Seriously, it's not hard to actually read his post rather than just looking at the pretty pictures.

~~~~~

For my own questions, when you say they can be reused until lost, how much damage do they actually suffer? I know UHMW is abrasion resistant and quite tough/impact resistant, but what actually happens to them after they've made a hole in object X?

How many destruction shots would they actually survive if not lost, is my question I suppose.

Also, you might want to tell people what size of 2" barrel, because those look sufficiently tight fitting that if someone has the wrong size barrel, they're going to be disappointed.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: far_cry » Sun May 17, 2009 8:15 am

so you work in machine shop .you know cnc milling and cnc lathe
like larda

nice work dude
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Unread postAuthor: jagerbond » Sun May 17, 2009 8:34 am

For my own questions, when you say they can be reused until lost, how much damage do they actually suffer? I know UHMW is abrasion resistant and quite tough/impact resistant, but what actually happens to them after they've made a hole in object X?

How many destruction shots would they actually survive if not lost, is my question I suppose.

Also, you might want to tell people what size of 2" barrel, because those look sufficiently tight fitting that if someone has the wrong size barrel, they're going to be disappointed.


I was actually very surprised with the resiliency. I suspect if you were punching holes in plywood, it could last all day. Slight deformation for us occured when we hit the leg of a C channel. We successfully straightened with vice and reused again. Check out the photos of the C channel and failed penetration attempt. We will try with Carbide and the BL-625.

The O-ring grooves are fairly relaxed and adjusted so the round would retain itself in the barrel and no tighter. These work with any schedule 40 2" pipe.

Mike
Sureshot / http://www.ultimatespudgun.com
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1/4" C channel damage
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1/4" C channel view 2
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Unread postAuthor: jagerbond » Sun May 17, 2009 8:38 am

Ragnarok wrote:
I know UHMW is abrasion resistant and quite tough/impact resistant, but what actually happens to them after they've made a hole in object X?



Usually the steel insert was missing and the nose had some coloration of its target, but seriously resilient.

Mike
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Unread postAuthor: dewey-1 » Sun May 17, 2009 11:39 am

Mike;

Now that is very impressive.

That price also seems reasonable considering machining time and material cost..

Is the UHMW basically 2 inch rod stock that is machined to that shape?
UHMW is $6.52 per foot at McMaster for 2 inch diameter.

I am guessing you get about 3 per foot. Is that correct?

Anyway that is still decently priced for the completed assembly.

Have you had a chance to possibly try it in a pneumatic launcher?
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Unread postAuthor: jimmy101 » Sun May 17, 2009 12:03 pm

Jager-
Those look outstanding!

How is their balance? Is the hollow tail enough to get them to be stable in flight?
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Unread postAuthor: pizlo » Sun May 17, 2009 12:39 pm

Any chance you could make these in smaller diameter? Say a .5 inch and a 1 inch? That would be exactly what I am looking for, and if they're 4 dollars a piece for the 2 inch ones then I'm sure they .5 inch ones could be a verry nice price.
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Unread postAuthor: jook13 » Sun May 17, 2009 2:03 pm

I second pizlo's notion. If you could make various sizes for common barrel sizes, I could see these being very popular on this forum. I would be interested in some 3" bore (schedule 40) bullets!
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Unread postAuthor: MountainousDew » Sun May 17, 2009 2:31 pm

Yeah, If you started making these in various sizes, it would definitely draw attention to your site, company, and skill. I would be interested in some 2.5 SDR 21/SDR 26 (which ever is the soda can barrel)... If you could, buy some different sizes of rods and experiment, for the children!
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Unread postAuthor: USGF » Sun May 17, 2009 4:37 pm

jook13 wrote:I second pizlo's notion. If you could make various sizes for common barrel sizes, I could see these being very popular on this forum. I would be interested in some 3" bore (schedule 40) bullets!


MountainousDew wrote:Yeah, If you started making these in various sizes, it would definitely draw attention to your site, company, and skill. I would be interested in some 2.5 SDR 21/SDR 26 (which ever is the soda can barrel)... If you could, buy some different sizes of rods and experiment, for the children!



The intent is to gauge interest in the various rounds. The giant lead pellets, though popular, we suspect will be too pricey to sell in quantity. These UHMW rounds will undergo more testing. More sizes will be made. Currently, all are machined on a large CNC lathe. It can handle up to 3.5" OD continuous bar stock. To lower cost to the end user, we are investigating the possibility of other production methods to produce the pellets in various shapes and sizes.
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Unread postAuthor: Lentamentalisk » Sun May 17, 2009 5:51 pm

In all honesty, I really don't think the o-rings are necessary. Yes, they will keep any air from escaping around the edges, but with all of the added friction, I am not sure it is worth it. As long as they fit fairly tightly, you should get better performance without them.
Other than that, my god they look beautiful...
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Unread postAuthor: jagerbond » Sun May 17, 2009 8:11 pm

Lentamentalisk wrote:In all honesty, I really don't think the o-rings are necessary. Yes, they will keep any air from escaping around the edges, but with all of the added friction, I am not sure it is worth it. As long as they fit fairly tightly, you should get better performance without them.
Other than that, my god they look beautiful...


The material came a tad smaller than the barrel ID and the O-rings help seal and hold the projectile in place. Agreed 2 is probably unnecessary. The size was adjusted so that there is just enough tension to hold in the barrel and no more. We use some PTFE super lube and I believe there is less friction loss than using spuds. For example, when we loaded this flush in the breach end of the barrel on the 520 you could pull it out by the inside of the skirt.

Mike
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