Custom chuck jaw for cast part

Hi all, I'm having a hard time finding the best way to manufacture the part below.
I designed some custom jaws but I think it won't work, there's no way to get the part into the jaws.

I don't want to order a new chuck with long jaw stroke, so I was wondering what could go wrong if I mill the some chamfer on the jaws, I mean, do I have runout problems if I remove the jaws and put it again(cnc lathe is new to me..)






I also thought about machining as below


I appreciate any help

I have seen 2-jaw chucks for casting work, with jaws made to fit the irregular castings, sometimes poured in place with a low temp alloy.

guismooo said:

Hi all, I'm having a hard time finding the best way to manufacture the part below.
I designed some custom jaws but I think it won't work, there's no way to get the part into the jaws.

I don't want to order a new chuck with long jaw stroke, so I was wondering what could go wrong if I mill the some chamfer on the jaws, I mean, do I have runout problems if I remove the jaws and put it again(cnc lathe is new to me..)



View attachment 323677
View attachment 323678

I also thought about machining as below
View attachment 323679

I appreciate any help

Click to expand...

Several common possibilities - some of which you might already own:

- The one you probably do NOT already have is a self-centering TWO jaw.

The others you probably do have or can fab easily:

- A 4 Jaw independent with top tooled jaws. Not all four jaws necessarily utilized.

- A 4-J CAN be utilized to center the axis of rotation of the PART with oddly-shaped parts themselves being swapped in and out of a fixture or smaller 2 or 3 jaw, tooled to suit, and held IN the 4-J, too.

- A 3 jaw self-centering with TWO jaws removed, the remaining jaw clamping against a fixture fastened to the body.

- A faceplate, tooled as required. Not a lot of limits here beyond your own ingenuiity.

All of those for "fewsies".

Volume production/CNC:

- a power operated two-jaw, tooled as required.

- In extremis, for truly dificult parts, a "capsule" or jacket that is attached to each part off-machine, the "cartridge" popped into a common collet system of adequate size.

- Use a CNC VMC, not a lathe, "tombstone" fixtured as appropriate.
2CW

guismooo said:

Hi all, I'm having a hard time finding the best way to manufacture the part below.
I designed some custom jaws but I think it won't work, there's no way to get the part into the jaws.

I don't want to order a new chuck with long jaw stroke, so I was wondering what could go wrong if I mill the some chamfer on the jaws, I mean, do I have runout problems if I remove the jaws and put it again(cnc lathe is new to me..)



View attachment 323677
View attachment 323678

I also thought about machining as below
View attachment 323679

I appreciate any help

Click to expand...

Can you grind or mill some clearance where needed in the jaws? They do not have to be symmetrical.

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Silent_Man said:

Can you grind or mill some clearance where needed in the jaws? They do not have to be symmetrical.

Sent from my SM-G930P using Tapatalk

Click to expand...

Really is that simple. You've already got it all drawn out, just toss
the jaws up on the mill, and take out the section that is giving you problems.

Bobw said:

Really is that simple. You've already got it all drawn out, just toss
the jaws up on the mill, and take out the section that is giving you problems.

Click to expand...

My fellow drama blocker!




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