It started with a block of 6061 and a dream

B

Bnhpr

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Hope it doesn't go flying off the bench with a 6br barrel on it.

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Sweet!

I have a project in mind as well, but the block of 6061 will be $500 or so, before machining of course.
 
???

Are you going to mount the barrel block to that center block that runs on the two round rods?? Then clamp a barreled action in the barrel block. I assume the springs are to assist in it returning forward, and the controles at the rear are the widage, can't make out the elevation.
Sort of a Rail Gun?? Or have I got it all wrong.......jackie
 
jackie schmidt said:
Are you going to mount the barrel block to that center block that runs on the two round rods?? Then clamp a barreled action in the barrel block. I assume the springs are to assist in it returning forward, and the controles at the rear are the widage, can't make out the elevation.
Sort of a Rail Gun?? Or have I got it all wrong.......jackie
Click to expand...

That's the intention, the 3/4 16 bolt in the rear controls elevation.

Not sure if I need the springs, the orcot bushings ride on the rails with considerable friction. I have different springs and stuff to play with.

I'm hoping the energy to be released in the rails, instead of dragging the points.

I case hardened the leg tips, and the intention is for this to set on my wooden bench.
 
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Orcot

I have machined bushings out of Orkot that were as large as 18 inches in diameter OD and 30 inches long. It is popular for bushing installations in very larger Rudder Tubes for boats and ships.
If it were me, I think I would have had the runners chromed and ground. Orkot, along with a lot of the non matalic bushing materials, have a tendancy to "grab" when in the static state. Once released, they slide quite free, though.
I assume that you do know that Orkot will swell with moisture.
Neat looking rig. Of course, the proof with anything is how it will perform.
But that is how we learn. Come up with an idea, build something, and see.
Good Luck.........jackie
 
Ben,

Interesting design and execution.

From what I have seen, there is one common design theme in all mechanical precision guide-way systems, and that is the use of dual guide controllers matched with a non-guiding stabilizer. In the case of a traditional railgun design, this would entail dual "v" block guides matched with a flat surface stabilizer, in the case of lathe bed it would be an elongated "v" guide controller and matched flat surface stabilizer.

I dont think a guide block tracking on 2 round rods can ever meet the precision trackability of "v" block/stabilizer tracking design. 2 rods will never be exactly parallel, nor of the same diameter, which also holds true for the bored holes.

I maybe wrong, and as Jackie says, the proof will show up on the targets...............Don
 
My logic in choosing orkot was that it has quite a bit of natural friction. I'ts a peculiar choice for me, because, I really despise the stuff. Although, that's not really fair, since whenever I've had an issue with it, it's usually being used in the wrong application (e.g. hydraulic rod end bushing)

If it doesn't work, bronze will go in next.

I turned the rods from EN 1014 steel, ground the rods straight, and polished with Clover leaf-extra fine.

Will let y'all know how she shoots.

Just playing in the shop

Ben
 
Linear Motion Bearings

I've had excellent results with THOMSON linear motion ball bearing bushings, and they have a sufficient amount of static friction.
 
I hope that it works for you, but think that you are going to be disappointed. I will say the same thing about Thompson shafting and linear bearings.
Butch
 
Ben,
The 2 that I built had the conventional vee and flats like a lathe. As I said before, for your sake, I hope that it works.
Butch
 
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Years ago I saw a rail gun built on Thompson "60Case" shafting and Thompson linear ball bushings. Looked fine, tracked bad.Maybe that's why you don't ever see a rail gun on Thompson shafting.

Mike Swartz
 
Butch Lambert said:
Ben,
The 2 that I built had the conventional vee and flats like a lathe. As I said before, for your sake, I hope that it works.
Butch
Click to expand...

Ok, if the tube doesn't track well, I'll scrap the middle section and build a V and flat setup. Not a problem, just lots of shavings.

Thanks

Ben
 
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