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  #11  
Old 02-13-2024, 12:18 PM
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If you have a fairly good slip fit, and you are able to tighten the holder down with bolts like drawn, you probably will have no problem.

Now, if the bolt was just tightened against the boring bar, like typical boring heads, then you might have a bit of slippage problem.


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  #12  
Old 02-14-2024, 09:22 PM
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Well, I have taken the plunge toward insert tooling. A friend bought a toolbox with contents and had no use for this tool and the inserts. A benjamin got me this and 20 CNMG432 inserts. Ten of the inserts are import, not sure of the other ten inserts. Twenty inserts should give me 80 cutting edges, which might last a while. Or not.

A trip to my local steel supplier for another chunk of bar stock, into the saw and then start whittling away.

First a few measurements. This a much bigger bar and clearances up and down are important.

Whittling is complete.

View of the writing on the tool. All holes have been drilled and tapped and tool installed.

Nine import inserts in the package, one in the tool. The other two are some of the unknown origin.

Sketch of the QC holder. There is more pressure down on the front of the holder than upward on the rear so I made adjustments to maximize the material underneath.

When I set the QC holder on the lathe, the adjuster screw was too short to allow it to set on the centerline so I swapped screws with another holder to get it to the correct cutting height.

I have no clue what material the inserts are for and whether they are for roughing or finishing. Any help will be greatly appreciated.
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  #13  
Old 02-14-2024, 09:59 PM
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Unfortunately you will only have 40 tips to use with those inserts, unless you have another insert holder that will hold those inserts 90 degrees rotated. Since those are a diamond shaped insert. Usually you only use the tips that are less than 90 degrees. I have seen holders that will allow you to use the other two corners, and would work for some turning. But will limit you to get to tight shoulders. Would be ok for roughing material down to size though.

You can probably make a tool holder to hold the insert at the angle you need.


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  #14  
Old 02-14-2024, 11:45 PM
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Quote:
Originally Posted by toprecycler View Post
Unfortunately you will only have 40 tips to use with those inserts, unless you have another insert holder that will hold those inserts 90 degrees rotated. Since those are a diamond shaped insert. Usually you only use the tips that are less than 90 degrees. I have seen holders that will allow you to use the other two corners, and would work for some turning. But will limit you to get to tight shoulders. Would be ok for roughing material down to size though.

You can probably make a tool holder to hold the insert at the angle you need.


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Nope. Those are negative rake inserts that can be flipped over and the bottom also can be used. So 4x per insert, times his 20 inserts.

Cnmg are a pretty common insert too, so it’s not a toolholder that will go to waste in time.


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  #15  
Old 02-15-2024, 06:14 AM
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Nope. Those are negative rake inserts that can be flipped over and the bottom also can be used. So 4x per insert, times his 20 inserts.

Cnmg are a pretty common insert too, so it’s not a toolholder that will go to waste in time.


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My bad. . So if he made another holder, he could get 160 edges.


As long as he changes them before they break, like I tend to do.


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  #16  
Old 02-15-2024, 08:05 AM
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Or like me, ordering CCMT’s for work, these days 100 or so at a time, I think each of the last three months.


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  #17  
Old 02-15-2024, 10:54 AM
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Quote:
Originally Posted by arizonian View Post
I have no clue what material the inserts are for and whether they are for roughing or finishing. Any help will be greatly appreciated.
I can't really make out the company name/makers mark on there, but that's where I'd start my investigation. No more wear than the holder seems to have on it, I'd suspect they were bought as part of a start-up kit. If you can track something like that down, you might be able to see the usages on the inserts.

As to the roughing vs finishing, Cutter showed me long ago that you can generally tell based on the "pointy-ness" . A sharper nose on the tool will tend to dig into the material and help keep the chatter down. A more rounded tip will both cut and "rub" the machining marks out. Now, don't take this as real information or technical advise...that's just what he deciphered and observed--and how he best explained it to me--and it has held true for anything I've done.
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  #18  
Old 02-15-2024, 02:32 PM
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Now for the next question. Will Mobil Vactra No. 2 be suitable for the gearbox? Oil level is approaching the lower limit. Grizzly G1001 12" x 36".
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  #19  
Old 02-15-2024, 04:17 PM
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My BIL found the manual online, Grizzly recommends an SAE 10-30 non-detergent oil for the gearbox. The hunt is on locally, else I will order online.
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  #20  
Old 02-15-2024, 04:51 PM
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Now for the next question. Will Mobil Vactra No. 2 be suitable for the gearbox? Oil level is approaching the lower limit. Grizzly G1001 12" x 36".
If the manual says to use an ISO 68, then yes.
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