Thought I would share something.

[crazy^millman]

Got this part we are doing. We need to do a pretty complex bore in this Clevis. The part has splines and has to be made out of rectangle plate. The bore is way off center of the Material. So I pulled up something we use to do years ago at a place I worked at. I took some 12" dia round stock and cut the jaw pattern and holes for bolts that would represent the jaws in back of the plate. On the front I milled the rectangle that is the size of the Material. I had all the block squared up and made the same size. Now I insert the block into the fixture and we can do the complex bore with undercut and radii with no problem on our lathe. We do not have to worry about a balance problem since we are using the solid round stock. We do not have to worry about holding the fixture in Jaws since it bolts right to face of the jaws using where the jaws would bolt as key to the key slots cut in the back. Perfectly centering the fixture, holding the work piece perfect using set screws to hold it in place and allowing the next op to go smoothly.

 

Many of you know we have an Integrex and if were not booked for the next 22 months it would have been done there verses the 4 operation it will take to prepare it for heat treat.

 

Here is a picture I got a file to share of it. I can not share the finished part, but you can see the concept if you like.

 

 

HTH

[Redfire427]

Thanks for sharing. I've been doing that for over 20 years on a lathe. It also works great on round parts that have a bore that is off centre.

[iowajim62]

Nice Ron

This method works well for castings also. Jack Screws cranked against locked screws on the Target/Datum points holds them nicely.

[kunfuzed]

Cool! This should be added to the Tips and Tricks forum. Right now there's only like one or two Tips and all the rest are just newbies posting in the wrong forum!

[GVM]

I was just trying to explain a similar set up to mount a faceplate to the chuck, but I like your idea much better. Solves some clamping issues.

 

Thanks for sharing.

[Camdude®]

Crazy,

my work access doesn't allow pictures, could you send me a picture please!

 

email [email protected]

 

thanks,phil

[crazy^millman]

Phil you have mail sir, but I sent you the MCX file with the Solids so you get the whole concept.

 

HTH

[Guest CNC Apps Guy 1]

quote:

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...Tips and Tricks forum. Right now there's only like one or two Tips...

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You'll need to change to "Show all topics" to see more. There's some dating back to 2001.

 

Enjoy!

[Camdude®]

Ron, i have not recieved the email yet but i got the concept after thinking things thru. Soemtimes it takes the ol brainbag an hour or two to kick in.

 

thanks,phil

[kunfuzed]

Ohhhh.... Thanks James!

[crazy^millman]

Everyone here is what the finished Fixture looks like:

 

Front:

 

Back:

 

They are putting it in the machine right now and it fits like a glove. Guy running the machine is little worried since it weighs 140 lbs and I will be running it at 2000 rpms for the turning work. He asked if we have life insurance and the shop foreman told him we have enough to cover the burial.

[cobra95kev]

Ron,

Just don't show the operator the pictures that were posted in the off topic forum the other day or you will be looking for a new lathe operator.

[crazy^millman]

Too late I showed them those months ago. I would max out the rpms on the machine running this part and never stress. This thing is interlocked with the jaw holders in such a way that the chuck will probably come off before this fixture.

[Philcott]

Ron,

 

Will this be turned into three jaws or or will this be a fixture and mounted in the chuck?

 

We have done similar setups where I mount the jaws on the lathe and mill out the needed shape using the "C" axis on the lathe.

 

It definitely allows easier and more accurate boring of an offset hole.

[Ron Branch @ Verisurf]

Nope we have the quick change chucks and the bolt on style stick out about .65 from the face of the chuck. So that is what it against the chuck. We have the same set-up on our Integrex for doing odd shaped. Works really well and you do not have to worry about the jaws influencing the part by doing something like this.