Carbide cutter bits unusual problem

[Vahmurka]

yep guys you are correct and your eyes serve you right, the cutter is 3/8 originally. To be able to use it in our holder we had to cut some flesh off the cutter so it gets lower than the center. Then we adjust the height. The cutter is on center. So that is wrong direction here, I'm more concerned if the angle is true.

Chuck up a dead center in the head stock. The tip of the cutter should touch the tip of the dead center.

The metal thing in my pics which is in the head stock is actually a dead center (chucked by the dead center end).

You do have too much angle. The cutting edge should be more square to the work piece.

Too much of which angle? With this single cutter we have to make two cuts: first cut the shaft/ferrule to be flat, then trim the tip side when it's glued on. As can be seen on the pictures, my priority is first angle being minimal. Which in turn makes second angle big.
Do you suggest I should turn the cutter counter-clockwise? How much? (A picture is worth thousand of words, like they say?)

 

[poolguy4u]

yep guys you are correct and your eyes serve you right, the cutter is 3/8 originally. To be able to use it in our holder we had to cut some flesh off the cutter so it gets lower than the center. Then we adjust the height. The cutter is on center. So that is wrong direction here, I'm more concerned if the angle is true.

The metal thing in my pics which is in the head stock is actually a dead center (chucked by the dead center end).

Too much of which angle? With this single cutter we have to make two cuts: first cut the shaft/ferrule to be flat, then trim the tip side when it's glued on. As can be seen on the pictures, my priority is first angle being minimal. Which in turn makes second angle big.
Do you suggest I should turn the cutter counter-clockwise? How much? (A picture is worth thousand of words, like they say?)

I would turn the tool holder clockwise some. But since it is on center now and if it is working, you can leave it alone.

 

[rhncue]

I use mine at all angles from just a slight clearance all the way to 90 deg. There is a radius on the end of the cutter so as it starts to get a little dull and not cut as well I change the angle slightly so that a fresh cutting surface is presented to the material.

Dick

 

[QMAKER]

Carbide cutters

I've been using the ones described in the post above by Dick Neighbors for
a few years now. Same cutter, same edge, for several years and no
appreciable wear.

 

[JoeyInCali]

http://forums.azbilliards.com/showthread.php?t=112050&highlight=insert

TCGT or TCGX is da s h a it. :grin:
Power feed away from the chuck sure hogs out a ton of wood clean and safe.

For delicate holes, I route/mill them.

 

[Vahmurka]

I would turn the tool holder clockwise some.

that's hardly possible since the way I set this up was turning the tool just a tad from cutter side being flat with the face. Turning it clockwise would mean back to flat.

I use mine at all angles from just a slight clearance all the way to 90 deg. There is a radius on the end of the cutter so as it starts to get a little dull and not cut as well I change the angle slightly so that a fresh cutting surface is presented to the material.

that's a good hint, will do that. But I tried the extreme position of the cutter (see pictured), think that is what you meant under 90 deg, and didn't like the way it was facing the shaft. It did the job but there was some slight wood residue around the edge (which is not there when the cutter has just a slight clearance, like you say)


Is this position ever acceptable?

 

[Vahmurka]

if I decide to try advised TCGT inserts - do I need another holder, or mine will do? As far as I can tell the distance from insert centre to edge and the holding screw head diameter are what is important.

 

[dzcues]

if I decide to try advised TCGT inserts - do I need another holder, or mine will do? As far as I can tell the distance from insert centre to edge and the holding screw head diameter are what is important.

It looks like your holder will work. See the first 2 minutes of this video to get an idea of how cleanly these inserts work. You will never see maple peel off in ribbons like this with the inserts you're using now.

Regarding poolguy4u's advice to rotate your tool more clockwise...I agree it's better to have the tool as close to square as possible but just shy of perfectly square so you can use the tip for both facing & turning. A degree or two is all you need.

Also, Dick's advice to slightly rotate the tool to take advantage of a fresh cutting edge works. Again, a few degrees is all it takes. You have just under 30° to play with.

 

[whammo57]

if I decide to try advised TCGT inserts - do I need another holder, or mine will do? As far as I can tell the distance from insert centre to edge and the holding screw head diameter are what is important.

The 3/8 tools will almost fit in a taig tool post slot but the cutting tip will be .125 inch too high. I have a taig milling attachment. I mounted a tool post on the milling attachment and using a 3/8 end mill, I cut the bottom of the tool slot down .125 inch. Now 3/8 tools fit in the tool post and the tip is at the right height.

Tool posts are available for around $6.

I can do pics if you want them.

Kim

 

[Tommy-D]

Maybe I just got a bad set,but all 5 of the 1/4 set I got at HF have slop between the insert and the edge of the holder that is supposed to keep it from moving,so even the best inserts ever wouldn't help. I quit using them.

I'll just have to get a better set at some point.

Anyone know if they make a DCMT version of this type insert? I have a Micro 100 SDJCR 3/8 holder for that insert and would like to find a better insert for that as well,even the TiN coated carbide .007 radius inserts I have for that holder don't like doing tips,just certain ferrule materials. Tommy D.

 

[poolguy4u]

Maybe I just got a bad set,but all 5 of the 1/4 set I got at HF have slop between the insert and the edge of the holder that is supposed to keep it from moving,so even the best inserts ever wouldn't help. I quit using them.

I'll just have to get a better set at some point.

Anyone know if they make a DCMT version of this type insert? I have a Micro 100 SDJCR 3/8 holder for that insert and would like to find a better insert for that as well,even the TiN coated carbide .007 radius inserts I have for that holder don't like doing tips,just certain ferrule materials. Tommy D.

Is this your holder? I buy most of my tooling from the Big Book from MSC.

http://www1.mscdirect.com/CGI/NNSRIT2?PMPXNO=1961905&PMTERM=

 

[Tommy-D]

Other than color (mine is silver),yep that's it.

I got the best inserts Travers had for mine,but they don't like leather at ALL. Tommy D.

 

[Vahmurka]

I found a insert size chart which explains every digit and letter in the code. I will measure the inserts I have and see whether the mentioned monster TCGT 32.52-AK suits me.

So far I tried to contact High Quality Tools considering retail purchase of this insert, and got no feedback. Could anyone help me to buy them (in case I am certain they gonna fit)?

 

[GBCues]

I found a insert size chart which explains every digit and letter in the code. I will measure the inserts I have and see whether the mentioned monster TCGT 32.52-AK suits me.

So far I tried to contact High Quality Tools considering retail purchase of this insert, and got no feedback. Could anyone help me to buy them (in case I am certain they gonna fit)?

Did you find it on the Internet? Is it in English?

If so, would you please post the URL/Link here?

I have
CCGT 21.51LF
CCGT 21.52SA
CCMT 2(1.5)1
CCMT 21.52

What does it all mean?

Thanks

Gary

 

[cuejo]

These are my favorite.
Ccmt 21.51
Kennametal kt315 coating.

 

[cutter]

Did you find it on the Internet? Is it in English?

If so, would you please post the URL/Link here?

I have
CCGT 21.51LF
CCGT 21.52SA
CCMT 2(1.5)1
CCMT 21.52

What does it all mean?

Thanks

Gary

Go to a good website for tooling deals, say MSC, or Iscar and they will give you a break down on the codes.

 

[whammo57]

I have the 3/8 tools and my 6-TCG-2112 TCGT 21.51-AK HO1 inserts are on order.

I modified a taig tool post to accept the 3/8 tools by milling the bottom of the slot down .125 in. That makes the tool tip the same height as the 1/4 in tool have. The 2 holes in the tool post is how I bolted it down for milling.

Kim

 

[Busbee Cue]

I have the 3/8 tools and my 6-TCG-2112 TCGT 21.51-AK HO1 inserts are on order.

I modified a taig tool post to accept the 3/8 tools by milling the bottom of the slot down .125 in. That makes the tool tip the same height as the 1/4 in tool have. The 2 holes in the tool post is how I bolted it down for milling.

Kim

Hello Kim,

I bought the same inserts last week and modified a taig tool holder to fit the 3/8 bit holder. I got this holder set from Shars 3/8" Indexable Carbide Turning Tool Set 404-1040 $27.60 . These bits cut day and night better than the high speed steel Taig cutters.

What a great improvement plus the cost is even less than the hss bits.

Have a good one.

 

[whammo57]

Hello Kim,

I bought the same inserts last week and modified a taig tool holder to fit the 3/8 bit holder. I got this holder set from Shars 3/8" Indexable Carbide Turning Tool Set 404-1040 $27.60 . These bits cut day and night better than the high speed steel Taig cutters.

What a great improvement plus the cost is even less than the hss bits.

Have a good one.

I got a set for $28 with free shipping. i got the inserts for about $6 each. I have to buy 4 more tool posts and modify them. I think I will use the old carbide 1/4 inch tools for phenolic and other hard things and save the new inserts for the wood and plastics. I should get them this week.

Kim

 

[Vahmurka]

Kim, thanks for the pictures. The system won't let me give you rep that soon after previous one. I reached the same task by grinding the cutter body down. Probably that is harder to do with strong steel rather than (Al) tool holder but that wasn't me getting the job done so I didn't care much.
And I still can use 1/4 cutters if needed.

Did you find it on the Internet? Is it in English?
If so, would you please post the URL/Link here?

Let me play Sherlock Holmes a little :smile:
CCGT 21.51LF
diamond shape, 80° nose angle, 7° clearance, 5/32 thick, .25" inscribed circle size, double countersink hole shape, single-sided chipbreaker, 1/64 radius, wiper lead angle 75°, clearance 25°

CCGT 21.52SA
same except for radius 1/32

Okay, here is how you can do it yourself