Tool Selection Help

J

jephw

Aluminum

Joined

Jul 23, 2020

• Jan 15, 2021

• #1

Good day all.
Please see the attached drawing. I have to recondition this roller. We are having a problem selecting an insert and holder that will work for this. Any suggestions as to how we could do this? The challenge is getting down into the trap and having only a corner radius of the insert at the very bottom. I'm thinking this will have to be a multiple tool job. A custom holder maybe?
Machine we are working with is a Mori Sieki NL3000y. Roller will be mounted to a fixture held in chuck.
Roller material is D2-CT, 59-61 RC. So insert will have to be ceramic. Or CBN?
Thanks in advance.

 

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Mtndew

Diamond

Joined

Jun 7, 2012

Location

Michigan

• Jan 15, 2021

• #2

1 vnmg tool should do the trick.

 

J

jephw

Aluminum

Joined

Jul 23, 2020

• Jan 15, 2021

• #3

Nope, not that easy. The holder will hit the walls of the roller before the insert will be at the bottom of the trap. See photos.

 

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Mtndew

Diamond

Joined

Jun 7, 2012

Location

Michigan

• Jan 15, 2021

• #4

Blend it with a left and a right hand?
If you need to, you could always kick the tool in the turret a few degrees to get at odd angles.

 

Mike1974

Diamond

Joined

Nov 5, 2014

Location

Tampa area

• Jan 15, 2021

• #5

Mtndew said:

Blend it with a left and a right hand?
If you need to, you could always kick the tool in the turret a few degrees to get at odd angles.

Click to expand...

Second that idea. Also, to OP, you can get different holders for a VNMG insert.

https://www.mscdirect.com/product/details/45577681

Not to mention using a thin parting blade, either with a full round, or a custom you could make inhouse if you have a diamond wheel and surface grinder and/or access to WEDM.

This isn't relevant to your problem, but just a heads up on different varieties of holders you can get.

 

J

jephw

Aluminum

Joined

Jul 23, 2020

• Jan 15, 2021

• #6

I have given thought to kicking the tool a few degrees and hitting it like that, but since this is will be a recurring job I'm looking more for a solution that will give me consistent setups with consistent results each time. That being said, I suppose I could machine a "V" the required angle so I have consistency every time.
Doesn't matter if its not relevant, good info. Thanks!

 

Mtndew

Diamond

Joined

Jun 7, 2012

Location

Michigan

• Jan 15, 2021

• #7

jephw said:

but since this is will be a recurring job I'm looking more for a solution that will give me consistent setups with consistent results each time.

Click to expand...

Buy a new tool holder, mill the old one on the angle you need, save it for that job and then it will be consistent.

 

Nerdlinger

Stainless

Joined

Aug 10, 2013

Location

Chicago, IL

• Jan 15, 2021

• #8

I use these in my swiss machines but it may work for your application. Scroll down to the "back turning" inserts. You can be turning in Z, stop, plunge in X for a sharp corner BEHIND the insert, and then proceed along in Z again. So in your photos you would go bottom to top, with the "sharp" edge of the insert on the bottom. That being said, I am often wrong!

Good luck!

https://www.iscar.com/newarticles.aspx/countryid/1/newarticleid/2833

https://youtu.be/C9iuWGW7ab8

 

K

kenton

Stainless

Joined

Dec 15, 2015

Location

Illinois

• Jan 15, 2021

• #9

This should have enough clearance, barely. I would rough it out with a grooving tool first.

McMaster-Carr

 

J

jephw

Aluminum

Joined

Jul 23, 2020

• Jan 16, 2021

• #10

Nerdlinger said:

I use these in my swiss machines but it may work for your application. Scroll down to the "back turning" inserts. You can be turning in Z, stop, plunge in X for a sharp corner BEHIND the insert, and then proceed along in Z again. So in your photos you would go bottom to top, with the "sharp" edge of the insert on the bottom. That being said, I am often wrong!

Good luck!

https://www.iscar.com/newarticles.aspx/countryid/1/newarticleid/2833

https://youtu.be/C9iuWGW7ab8

Click to expand...

I can see this type of insert working, but as I see it its not available in ceramic. Thanks for the suggestion, got another project I might use this style of insert.

 

michiganbuck

Diamond

Joined

Jun 28, 2012

Location

Mt Clemens, Michigan 48035

• Jan 17, 2021

• #11

A parting wheel slice in the shank, bend it to an angle the will work and then run a weld to make it solid again.
still a little bench grinder grinding might be due.