I made a barrel block

Jackie-

Now I know the purpose of the dumping material so I have a question. It may be a question of an imbecile, but what about using a cardboard instead of Nylon? Some of the packing postage tubes could provide the "size" of the basic starting material.

Shoot well
Peter
 
Rustydog,
I don't know about your area, but we have plastic suppliers around. Do a search on the internet. I have used a delrin sleeve and have bedded them with Devcon.
Butch
 
If you live in the boonies like I do, you just about have to order anything that you want to use. I've used both delrin and linen based micarta. I bought both products from MSC Industrial Supply. I went to the linen based micarta after talking to Dave Tooley about his experience with delrin sleeves in the 1000 yard guns. He told me that the heat from the big boomers used in 1000 yard shooting would heat up the delrin and the delrin would expand enough to strip the threads on an aluminum barrel block. I haven't seen a problem though with delrin sleeves on short range rail guns probably because of the size of the cartridges being shot. By the way, the first delrin sleeve that I saw being used was on Lester Bruno's railgun the year that he won both the NBRSA and IBS nationals in the same year. That doesn't mean that he was the first to use it, but it certainly didn't hurt the agging ability of his rail gun.
 
Mike

The heat expansion rate on that high impact Nylon is about 1/4 what Delren is.
One reason something like cardboard would probably not work is it is not stable enough. These high dollar Delrens, Nylons, and Phenolics are very stable, and will maintain theri shape and stability under tremendous loads. The Nyon I use is specifically made for use in Rudder Bushings in Tug Boats and other harsh inviroments.
Keep in mind, that barrel has to be 100 percent secure in that block........
 
Just speculation, but as someone who has used barrel blocks on 1K guns, I wonder if the nylon (plastic) isolating bushing is important only on rail guns -- or wherever you can get 10 shots off in 10-12 seconds.

We've seen a phenomena on the 1K HGs where they keep vibrating for a bit, longer than it takes to reload -- which once lead Dave Tooley to remark that you can shoot them too fast. Of course, everything is vibrating on these, block or no block -- including the scope. As they aren't RTB, a barrel isolation bushing likely wouldn't solve the problem.
 
Jackie/ or Whoever

I have an another question of an imbecile. What about a thick leather (belt for an instance)?

A friend of mine was on a holiday in old Soviet Union and his motor blew up so it was fixed in a local wiliage Kolchoz farm repair station. He was adviced to have the motor fixed as soon as he gets home. He didn't. About 16 months later the motor blew up again. It was taken appart and to the surprise of all, the Russians fixed the conrod bottom large end composition bearing with a replacement. AN ORDINARY BELT FROM TROUSERS. This replacement lasted 16 months without any signs of damage, and it was an another composition bearing that gave him the grief.
To form a leather into a shape, soak the leather in water for several hours and press it into a shape of die (block) tightened hard and leave it there to dry. This could be done with the block and the barrel to serve as the die (perfect fit) and just to turn up the bolts more afterwards.
Just a thought.

Shoot well
Peter
 
Peter

I suppose you could come up with a miriad of materials that could be used as a isolator.
I tend to use things that were specifically designed for an application. I didn't just use the Nylon because that was what I had laying around. I have several different non metallic materials at my shop that are designed for busings in high load conditions.........jackie
 
Question for everyone

Is there anybody who had try to use a multiflat barrel (12/16/24/etc.) to see if it would/could minimise the barrel vibrations associated with the rapid shooting of the rail gun?

Shoot well
Peter
 
Peter

This is just my opinion, based on my experiences, but all of that tripe you read on these forums about how the outside shape of a barrel affects the agging capabilityof a barrel is a bunch of wishfull thinking. The thing still vibrates, just in a different manner.
The best thing that most of us have found is to find a way to dampen the vibrations as much as possible.
Ever looked at one of my bag gun tuners. Notice that rubber "snubber" pressed over it. It is not on there for looks.........jackie
 
There have been lots of methods tried to make the barrel on a rail gun to minimize vibration. I'm glad to hear that Jackie's results with the nylon sleeve have been comparable to his epoxy filled steel tube. I'm planning on my next rail gun barrel to have an aluminum full length tube with the barrel centered and held in place with cerrosafe. Not anything new, but just trying something that has been done before by others myself.
 
Jackie

you've probably heard of chockfast orange?

I bet it would be a good material to bed/fill the tube with.

I've seen it under the foundation of a 120,000 kw diesel engine.

Ben
 
Ben

The last couple of tubes I did, that is exactly what I used. I could generally bum a can from one of my Shipyard Customers. They generally keep several around.
I generally used just pourable steel Devcon. (That term "pourable" is a stretch). It worked great, and a one pound can was just enough to fill the tube.........jackie
 
Mike

The tubes were a lot of work, and if I find out in our first match in March that the Gun doesn't really shoot as well, I can go back to it.
But like I said, it is a lot of work. If it aggs as well with the isolator bushing, I will be tickled pink.........jackie
 
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