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Old 02-09-2020, 10:55 AM
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Bubba Bubba is offline
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Default Let's make a top notch insert holder.

I have a bunch of top notch inserts both slotting and threading. They are
really tough inserts. Also sometimes they show up pretty cheap on ebay.
The holders are really expensive. The tip is offset 3 Deg. so the pocket
had to be tweaked to that. The top clamp was a bitch to machine.
Here are some pics:
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Old 02-09-2020, 11:15 AM
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Quote:
Originally Posted by Bubba View Post
I have a bunch of top notch inserts both slotting and threading. They are
really tough inserts. Also sometimes they show up pretty cheap on ebay.
The holders are really expensive. The tip is offset 3 Deg. so the pocket
had to be tweaked to that. The top clamp was a bitch to machine.
Here are some pics:
Now you need a bigger lathe so you can take really big cuts.
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Old 02-09-2020, 12:06 PM
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What steel are you using to make these holders? I have a selection of old inserts at work with no holders, and have thought about making some, if I ever have any slow time again. I know my machining time is not worth the time vs just having the boss buy the holders, as long as I actually have paying jobs I could be doing, but sometimes there is no machining to be done and I have to find something to fill in the time. Making holders that can utilize valuable inserts qualify for me.
To the other guys I usually say “if you have time to lean, you have time to clean”


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Old 02-09-2020, 01:58 PM
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These were 4140. I know I should heat treat them but the oven is a
future plan. As I tried these were good enough the way it is for my
14/40 chinese lathe. The top notch inserts are really tough because
the vertical setup. Here is a video a guy cuts a thread in 3 passes
into high tensile bolts.

https://www.youtube.com/watch?v=-juPIMMZCkw
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Old 02-09-2020, 03:02 PM
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Sometimes ‘tough’ is better than ‘hard’. Nice work Bubba.


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  #6  
Old 02-09-2020, 06:23 PM
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good work, and a good exercise to keep your skills sharp
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  #7  
Old 02-09-2020, 08:39 PM
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LKeithR LKeithR is offline
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I wish I had the time to sit and make toolholders--well, maybe not really. I can think of lots of other things I would make if I actually had the spare time. To my mind toolholders and inserts are simply consumables; you buy/replace them as you need them.

I agree about the top notch inserts though. Definitely tough and versatile and you can buy a wide variety of inserts for both threading and grooving. I think the first ones I ever used were Sandvik when they came out with them in the 80s. They've been copied a lot but I think Sandvik were the originators.

I've never warmed to the laydown style inserts--they do seem to be more popular in CNC applications...
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  #8  
Old 02-09-2020, 09:56 PM
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Quote:
Originally Posted by greywynd View Post
Sometimes ‘tough’ is better than ‘hard’. Nice work Bubba.


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Generally commercial holders are 1/2 hard, full hard would make the too
springy and you will be fighting chatter BIG TIME!!! Also commercial
holders are 4140 as well.


Commercial top clamps are powder metal and sintered.

Top-notch and Top-lok use the same holder but the top clamp is different.

You can just buy the top clamps without the holder.
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Old 02-09-2020, 10:21 PM
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Quote:
Originally Posted by LKeithR View Post
I wish I had the time to sit and make toolholders--well, maybe not really. I can think of lots of other things I would make if I actually had the spare time. To my mind toolholders and inserts are simply consumables; you buy/replace them as you need them.

I agree about the top notch inserts though. Definitely tough and versatile and you can buy a wide variety of inserts for both threading and grooving. I think the first ones I ever used were Sandvik when they came out with them in the 80s. They've been copied a lot but I think Sandvik were the originators.

I've never warmed to the laydown style inserts--they do seem to be more popular in CNC applications...
Kennametal was the first, Sandvik followed them when the patent ran out.
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  #10  
Old 02-10-2020, 07:35 AM
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I have a supplier, they let me "search the back room to peruse their shelves, 90% nib toolholders, others lightly used & clean,...pretty much everything is $20.
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