Vice machining

[R.DesJardin]

Well I just had to get it out of the way. Started really running the mill today using Solidworks to design, SprutCam to get the code and then made a part. Tried the second part after "tuning" up the feedrates and now I have the traditional groove top vice jaws. Totally my fault to much to fast. All in all I am very happy with the Tormach. Just need to be patient.

[vlmarshall]

I feel your pain. I made my first TABLE mark a few days ago... something I haven't even done at work in almost 15 years, and of course, it was at home, on my tiny little Sherline.
Like your vise slot, it was due to my own mistake. Oops.

[Geof]

I think everyone has one or more groove top vises in their history.

[DareBee]

Would hardly be human not to

[zephyr9900]

In the "interactions" between endmills and my Tormach/MiniMag vise (acknowledging the difference in spelling between the Old Country and the Colonies ) jaws that I have caused, the endmills have come out for the worse. Barely a shadow on the vise jaws, and dulled cutting edges on the endmills...

Best regards,

Randy

[vlmarshall]

Originally Posted by Geof I think everyone has one or more groove top vises in their history.

That's true. One day I was working on some tiny aluminum part, hanging out of one side of the vise...I changed a line to take a finish cut, hit start, and went back to deburring.
When the program stopped I found that I'd swapped a Y for an X (oops) and cut a slot .187" wide and half an inch deep right into the side of a Kurt vise jaw. How that endmill held up, I have no idea, but it did break when it cut through into the counterbore for the jaw bolts. I should post a picture of that, it became one of 'my' sets of vise jaws, and is still floating around the shop somewhere.

[keen]

Ouch! 8.0 mm dia carb ball nose end mill got blunt/work hardened on a major machining toolsteel job the other day. - stalled the spindle then broke. Ouch ouch.

I wonder what it takes to bend the spindle or damage the spindle bearings. My R8 taper now runs out 0.0018mm (0.009mm off centre) - Not much really, but I am sure it was less than that when new!

Any thoughts/other examples/similiar damage?

[keen]

Sorry I mean 0.018mm run out (0.009mm off centre) - Thats 0.0007" run out.

[philbur]

This is getting more confusing. You say 0.018" run-out (which is huge) then you say 0.0007" run-out which is within spec.

Which is it. Perhaps it would help if you described how/what you are measuring. Are you measuring directly on the the taper, or .......

I very much doubt that an 8mm carbide cutter has the strength to bend the spindle. Otherwise there would be many bent spindles out there.

Phil

Originally Posted by keen Sorry I mean 0.018mm run out (0.009mm off centre) - Thats 0.0007" run out.

[Geof]

Breaking an 8mm cutter is never going to damage the bearings or bend the spindle but it will very likely damage the tool holder.

Where are you measuring the runout, directly on the spindle taper or inside a tool holder?

[vlmarshall]

Originally Posted by philbur You say 0.018" run-out (which is huge) then you say 0.0007" run-out which is within spec.Which is it.

He didn't say .018", he said .018mm!


Yeah, it's quite possible to have knocked the center bore out of round. Still, .0007" isn't so bad, that's what cutter comp is for. I'll bet that a quarter of the toolholders where I work have been crunched once or twice.

[philbur]

Sorry, my miss reading.

I think the run-out for a standard ER collet is something like 0.02mm. Also according to the test cert. for the machine the R8 taper in the spindle is max 0.02mm run-out so I don't see that he has a problem.

Phil

Originally Posted by vlmarshall He didn't say .018", he said .018mm! Yeah, it's quite possible to have knocked the center bore out of round. Still, .0007" isn't so bad, that's what cutter comp is for. I'll bet that a quarter of the toolholders where I work have been crunched once or twice.