502 forum posts
Hi all I'm back in the workshop at last and I have a problem already.
I want to clean up the ends of a slab of aluminium, doing one end and then milling the other to a particular length.
However its a bit too big to clamp down. Its 12" long so can't put in the vice and its too wide to clamp on the mill bed, it covers all the t slots.
I can clamp one end but not the other. Grrrr
|David Littlewood||24/07/2013 15:01:59|
|533 forum posts|
Why is it too long to fit in the vice? If it is a chunky slab it should be rigid enough with say 4" overhang at each end. If not, hold it so one end is close the vice, clean up, move it so the other end is close to the vice, clock the clean end with a centre finder, wind along (ensuring you correct for backlash) and Robert, as they say, is your mother's brother.
If for some reason this won't work, you may be able to clamp it to the bed using toolmakers' clamps, but this may restrict table movement.
Alternatively, if it is to have any holes in it, make the holes first, use them to hold it to the table, and clean up ends to match hole location.
|Russell Eberhardt||24/07/2013 16:07:18|
2728 forum posts
I don't know what lathe you have but you may be able to clamp it to the cross-slide and use a flycutter in the chuck.
|Andrew Johnston||24/07/2013 16:46:52|
6574 forum posts
Turn it through 90°, so it hangs off the front of the mill, setting perpendicular with a square on the edge of the table. Mill one end, and then turn it round.
502 forum posts
By in the vice I meant upright, in other words the vice has only the bottom end. I tried it the other way on and no matter which slot I mount the vice in the milling cutter doesn't quite traverse the whole end grrr.
Tried mounting it lengthways but as I have to raise it off the bed getting it square is the problem there.
|Les Jones 1||24/07/2013 22:53:15|
|2255 forum posts|
22574 forum posts
Wolfie can you give us the other two dimensions of teh block so we have a better idea of what needs machining.
As les and Andrew say hanging it off the front of the mill is probably the best way as you have the longer X axis travel and just clock it in with a dial gauge. Or if you can't hold the squate against it when packed up put the stock of the square against the flat column but clocking it is more accurate.
If you have enough movement on the cross slide of your lathe then pack it up off that and again clock it true before flycutting the end. I had to resort to this the other day on a large engine base casting
6192 forum posts
Couple of angle plates bolted to the t-slots and the block of aluminium clamped/bolted to the angle plates?
|colin hawes||25/07/2013 11:22:10|
|557 forum posts|
Sometimes on a job like this it is possible to drill and counterbore a couple of tooling holes in a place that won't show on the finished job or where they will subsequently be machined away. Then you can clamp into tee nuts. Colin
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.