2014 POTD Thread Archive

Also grinding out a channel in the joint would help with 2 or 3 passes with a lower end welder. Personally I run a miller syncrowave 210, TIG. I sold my wire feed, I love TIG welding.
 
chuckorlando, heres an action shot of my favored ccmt holder, equipped with a Kennametal KC850, 21.52, the cut is 4140 steel,1.5" dia, turned ground, polished. .050 DOC, .0042 feed, around 600rpm. the finish is absolutely amazing, rainbowescent, very pretty, all my holders are currently 1/2" but I plan on getting some XL holders so I can get some 3/4 holders for more variety and better selection of holders that aren't available with 1/2" holders. I run a BXA post on my Atlas 12"
ccmtturn.jpg

ccmtturn.jpg
 
Awesome. I have watched abom use them ccmt for a while. I think I need a few. I have been using tt's and they do ok. But I want to try some other styles.Looks like the ccmt might have more nose radius then the diamonds or triangles. Maybe not though
 
Well you can order with different nose radius, a 21.52 is more rounded, for medium to finish machining, a 21.51 has a sharper or smaller radius and is for finish machining. Sandvik was really helpful on the phone helping me decipher the codes of those numbers lol. Sandvik will also send you a sample of the cg432 (I think) inserts, they sent me a pack of two ccmt 32.52 for my larger boring bars. I think you can even get 21.50 inserts which have a very sharp radius. Those numbers apply to both dcmt and ccmt, and I think all others too.
 
MozamPete said:
While back home for a holiday and staying at my Mum's I took to putting up some shelves and tidying up her garage. One of the finds was an old rusty 3" Record G-clamp missing its foot. As it was of no use as it was, I decided to take it home to give it a new lease of life.

Machined up a new foot on the lathe and decided to have a play with electrolysis de-rusting which turned out much better than I expected - wish I had taken a proper 'before' photo. A fresh coat of paint and it's good for another 50 years.

C-clamp as found - sorry didn't take a proper photo this is just a crop out of the corner of another photo.
View attachment 88880

After electrolysis de-rusting of the body (but before de-rusting of the screw for comparison)
View attachment 88881

After a coat of paint and with the new foot installed. I just blackened the screw with a rust inhibitor (phosphoric acid based I think).
View attachment 88882
Click to expand...


Great job. A lot of my c-clamps have new feet.
 
CCMT & DCMT are my mosed used inserts on the lathe, followed by CNMG (well I actually use CCGT, DCGT, & CNGG). All but 1 my boring bars use CCMT as well.
 
chevydyl said:
chuckorlando, heres an action shot of my favored ccmt holder, equipped with a Kennametal KC850, 21.52, the cut is 4140 steel,1.5" dia, turned ground, polished. .050 DOC, .0042 feed, around 600rpm. the finish is absolutely amazing, rainbowescent, very pretty, all my holders are currently 1/2" but I plan on getting some XL holders so I can get some 3/4 holders for more variety and better selection of holders that aren't available with 1/2" holders. I run a BXA post on my Atlas 12"
View attachment 88973
Click to expand...
chevydyl,
Thats awesome!
I have a Cman/Atlas 12" lathe with AXA post & have been told, (here) that the 12 " is not "robust " enough to handle indexable tooling ???

I need to do some research to understand the acronym lingo

Also If you would suggest a list of your favorite tooling, I'll just get the stuff at Sharis

Thanks for your time with this
ed
 
Shars has a 7pc set, not sure how big of holders the AXA holds but they have what you need, the parting/grooving holder that comes with it is junk, broke it lol, the threading holder that came with it, I broke the insert on ALUMINUM!!! but the rest of the holders are great in the set. I ordered some TiN inserts from them with good luck, but since you can find name brand at decent prices that's what I'd do. Call Sandvik tell em what your cutting and they'll help out. Shars has "crap, better, and good" tooling I also bought their boring bar set that uses ccmt inserts 4pc set up to 3/4 " bar.


Most of what I was told was that indexable wasn't necessary, a good sharp hss tool would be more than enough, don't waste your money on carbide, well taking 20 mins to grind a fresh 3/8 bit is a waste of time lol. Although there is that, one cut where carbide holders either won't fit, or won't reach, or where your qctp is too large. Always keep your lantern, and always keep some hss bits around. I posted earlier in this thread where my bxa post was in the way and I had to blow the dust off the ol lantern and grind a special 1/4 in bit to get the job done. Had I sold the lantern post I would not have been able to do that job
 
Another thing to note, the size of the insert and the chip breaker, you don't want to use big 432 size insert because these lathes just simply cannot take deep enough cuts to use the chip breaker right, you get heat buildup and wear out the edge of the insert. In that pic above that .050 was a good cut, but I took it to .060 and it was like that insert was doing what it was supposed to do, chips were flying everywhere, blue hot chips, just like it was designed to do, to get the heat out with the chip instead of leaving it all in the work and on the insert. Personally I think that's about the max for my lathe, broken gears are a pain. Imo I think the 21.5 insert is the right size for general turning on the C/A 12"
 
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