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Old 01-15-2013, 08:09 PM   #2221 (permalink)
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lol you can make at least 2 of these per length of round bar!
Right. I just meant that the radius would be pretty easy if you started with round bar and went from there. Otherwise I could always widen the rail so that it's a semi-circle so that it's easier.

I'll have mine next week, ordered it through a local shop and they have to send it to me once they get it since it can't be drop shipped :/ just need to find some cheap phantom parts and get this plus a few other things made.

Figure these could be done in 2 pieces, but I think a slide on version would be better. Just use the screws to keep it from moving back and forth.
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Old 01-15-2013, 09:08 PM   #2222 (permalink)
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how easy would it be to make a T-2 to pic rail adapter using the same design?
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Old 01-15-2013, 09:24 PM   #2223 (permalink)
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how easy would it be to make a T-2 to pic rail adapter using the same design?
To use a Pic rail on a T2 or to use a T2 feedneck on the hammer 7?
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Old 01-15-2013, 09:36 PM   #2224 (permalink)
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Originally Posted by Skibbo View Post
Cut it out of round bar? Like I said, not a machinist so no idea what would work the best.
If you start with round bar, you have no way to hold the part while you machine the slot.

A redesign would work the best. Barring that, it just adds quite a bit of cost to it.
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Old 01-15-2013, 09:38 PM   #2225 (permalink)
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If you start with round bar, you have no way to hold the part while you machine the slot.
round bar, machine the flats on the side, use flats to hold it, machine slot and everything else?

My thinking could be off.

I'll keep tinkering with this to see what would be the easiest. perhaps do one part with the slot and use round bar cut in half then attached to the flat to make the entire part?
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Old 01-15-2013, 09:39 PM   #2226 (permalink)
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If you start with round bar, you have no way to hold the part while you machine the slot.

A redesign would work the best. Barring that, it just adds quite a bit of cost to it.
the curve is necessary because that's the phantom feed shape.
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Old 01-15-2013, 09:58 PM   #2227 (permalink)
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Originally Posted by Skibbo View Post
round bar, machine the flats on the side, use flats to hold it, machine slot and everything else?

My thinking could be off.

I'll keep tinkering with this to see what would be the easiest. perhaps do one part with the slot and use round bar cut in half then attached to the flat to make the entire part?
Oh... I never thought of that...Wait. How the hell do you hold it to machine the flats on the sides?

If I say that it's a costly feature, it's a costly feature. I'm not teaching a 101 course on workholding. If it's essential... Then there's nothing we can do about it. The radius adds as much cost significance to the part as the slot.

Special cutter? More costly. Special fixtures? More costly. A lot of material removal? More costly. Trying to cut round stock in half to yield more parts? A lot more costly.

Try to minimize the number of "more costly"s.
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Old 01-15-2013, 10:07 PM   #2228 (permalink)
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Oh... I never thought of that...Wait. How the hell do you hold it to machine the flats on the sides?

If I say that it's a costly feature, it's a costly feature. I'm not teaching a 101 course on workholding. If it's essential... Then there's nothing we can do about it. The radius adds as much cost significance to the part as the slot.

Special cutter? More costly. Special fixtures? More costly. A lot of material removal? More costly. Trying to cut round stock in half to yield more parts? A lot more costly.

Try to minimize the number of "more costly"s.
could we print them up? seems like that would probably be more costly though.
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Old 01-15-2013, 10:10 PM   #2229 (permalink)
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Get rid of the threaded holes in the side and jut put them in the top. gets you the same result with 1 less setup and operation. unless you were silly and put them on both sides. then you save 2 setups and operations lol.

Profiling the top really isnt a big deal unless you are trying to make it on a manual mill. it goes slower than just facing but its reasonably quick.

Other than the double angle cutter for the inside i could make that right now.
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Old 01-15-2013, 10:11 PM   #2230 (permalink)
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could we print them up? seems like that would probably be more costly though.
You could. But it's not that high quality of a solution for a structural part.

How many do you want to make?

I concur with dukie's assessment on the side holes. The issue with the radius is either the same as the slot cutter (purchase the correct tool) or use a 3d milling path.

A standard .5" radius tool won't work because the bottom of the tool won't clear your vise. I guess, depending on how much material you start with... It would kinda suck to have an extra half inch of material to machine off just for the roundover.

3d milling is just time consuming, and machine time is expensive. Depending on how many parts you're looking at making, 3d milling is more expensive than using a roundover tool.

I have the double angle cutter on hand... Except for having to grind the crap out of one of my nice roundovers, I could make that part tomorrow. (I'm done working for the evening.)

Last edited by alpha434; 01-15-2013 at 10:18 PM.
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