Thread: workholding help with this v shaped part

alright guys, update time.
decided to try one last thing before i welded to these pieces.
i know this is a dodgy set up but the tolerance was not tight, just a weldment for foot controls on an MC.
that said there was a fair amount of chatter, presumably from the deflection but it worked perfectly fine all things considered.
probably a bit tricky to tell from the pics but set up was 1/4" x 2 angle drilled for through bolts and attached to a 30 degree angle plate, pinched in the vise with a piece of ash against the fixed jaw and an aluminum soft jaw on the sliding jaw.
went nice and slow with counter bore operation and flipped 180 for facing on other side with a brand new 3/8 4 flute. Looks good, nice and level and a n almost perfect fit. starting finish welding now so will update here later in the week with finished pics as well.

as a side note this is my first post from inside the shop with a desktop on the shop desk, having internet access in the shop is amazing!

thanks again guys

I stuggled for several minutes considering this a "fixturing for vertical mill" challenge.


Those suggesting this is a "fixturing for lathe" situation seem to be on the right path.

Perhaps a faceplate with split bore clamp/collet/endmill holder, etc. mounted on the faceplate, or clamped in a chuck. The chuck stays clamped tight to the fixture, it's the fixture that clamps/releases the workpiece.

What is the specified tolerance? Any issues/concerns with minor cosmetic flaws, such as setscrew marks?

I can easily see the fixturing costs exceeding the actual operations costs.

Good Luck,
Steve

your absolutely right Steve, the fixturing and setting up on this one easily outweighed any profits.
its done though and well within tolerance so i guess i will consider it another valuable workholding lesson learned. In the future i would love to take this kind of thing to the leblond but i REALLY need to invest in goodies as i'm more or less limited to 3 or 4 jaw currently.

I would also agree with Limey and ask why not the 3 jaw on the lathe?It certainly looks as if the jaws could easily clamp onto
the short stub without an issue It would have to be not too large a 3 jaw ,but doable,,,,,,,i guess everyone 's an expert on the
internet.

Maybe the vise in the mill could also work,are the short cylinders not 2 points on a line? if you catch my drift.I know you said it moved,but
at first you asked for advice about fixturing for the drill and c'bore operation,but then you show a fixture for holding the part after the drilling and counterbore?,,,,,,did I lose the plot? which one are you finding most difficult?

You said the drilling was ok, I'd use the bolt holes to bolt the unit to a fixture plate and then clamp the plate in a vise.