Gallery, Projects and General > How to's

How to clamp these up

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hopefuldave:
I'd just use a V-block lying on its side against the mill vice's fixed jaw...

That may be Too Simple though, I'm kind of assuming you have a mill vice that'll open far enough!
If your vice isn't big enough it wouldn't be a hard job to make an impromptu (just-about-accurate, not talking surface ground!) shallow V-block that *will* fit in with the 'bar riser?

If you have a lathe with a 4-jaw chuck, you could centre-punch the hole location, get the punch mark centred with a wiggler and drill from the tailstock - would be my easiest solution if I hadn't the big-enough mill vice. Judging from the risers' appearance, you have a suitable lathe...

Dave H. (the other one)

MadNick:
Thanks again for all the help and suggestions.

I have to do more measuring before doing any cutting and will let you know what happens :)

Nick

Lew_Merrick_PE:
Nick,

Speaking for ignorance of the details, you want to drill through from the "back side" of the casting concentric with the (2) ø5/16 holes.  Is that right?

It seems to me that:  (1) You have a pair of bosses that appear to be 90° to the spot-faced surface around the holes.  (2) The (ø5/16) holes have a spotface about them that is (probably) normal to the axis of the hole.  Thus, you could make an appropriate diameter locator that has a (presumably) ø5/16 tit on the end (or pressed in ø5/16 pin) to locate the hole concentric to your spindle.  An angle plate butted up against the bosses on the end should give you alignment in that axis.  A pair of screw jacks or mated wedges carefully applied should support the "ends" of your casting such that you can get a strap clamp of some kind (probably with some packing alignment stuff) to clamp the unit down onto the jacks or wedges.  A C-clamp (G-cramp -- to those on the other side of the pond) will hold things to your angle plate.

Assuming that the other side of the casting does not have a nice flat surface, use an endmill (slot drill -- to those on the other side of the pond) to estabalish a spotface slightly larger than the hole you need to drill.  The rest should be simple -- if my assumptions are correct...

MadNick:
Thanks Lew,

I would have loved a diagram to see how that would work, my minds eye was struggling a bit.

Thanks for all the comments, heres how I did it in the end -




Worked a treat......so far!

Nick

krv3000:
good job

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