Thread: Superglue and Washer Turning

Bruce,

The shortcoming, for me, of the CTC tool is a maximum depth of cut of 15mm as per your email. I have chopped off 63mm bar with the HSS cutter. The price is attractive though.

I had a look for an Iscar 26 - 2 holder and inserts. Found one and then when I checked out the Iscar website found that the holder is available in left and right configuration ( I have no idea of the handing of the one for sale ) and that the inserts appear to be superseded. The usual carbide minefield. The skinny Iscar is appealing because I reckon I could modify my rear post to suit it.

Bob.

Bob,
With regards to insert blades I would suggest that you look at the biggest one depth wise as all of the strength is in that section of the blade that is above the insert .Very important if you need to part of larger diameter bar. Looking at your current blade holder you could make dog leg shaped top clamping plate or just a lot thicker one to allow for a wide blade. Have a look at the top clamping plate on mine, that holder was originally designed for a 25mm wide blade I modified it to suit the 32mm one. With the blade sticking out as in the photo I can part off 2.5" bar and have cut 3" bar with only a slight extension of the blade. I looked at CTC line of parting tools but found they would be too limited for my application, they would be good for a production shop where time is important as I am sure you could up the feed rate a lot with them.
Bob

A little edit to Bruce's post. I use a 16 x 16 body on the Hercus 260 rear parting tool post but it may be a Myford post and not a genuine Hercus post. The 12 x 12mm parting tool is set up on the rear of my little Hardinge turret lathe.Both use the 2mm inserts with no real problem and for most work I am not troubled by the small reach (30mm).
I do use 2 different tips ,one for aluminium and brass and one for S.S. .Just been parting off some SS 304 bolts and it works fine when the speed is right.I did try to order it as a 1.5mm tip but they couldn't at that time supply both tip styles so I opted to go back to the more common 2mm.
As for the original post about parting washers off to get a good finish I would just part them over-width and re-chuck to turn the other face.Set it in the chuck with a "bearing on a stick " tool and take a fine finishing cut.I can't see a problem holding 4mm thick steel for the job.

I can't see a problem holding 4mm either Micheal but those washers were 3mm thick with a 1mm deep bevel on one side. A whisker under 2mm to cling onto. The stuck bearing thingo is neat but it wouldn't have helped me in ensuring that the five washers were of uniform thickness.

Still, I have proven that my parting off skills are lacking, might also apply to workholding.

Bob.