Parting Blade Question

[WarrenP]

Hi Everyone, I have what Im sure is an easy question for most of you. I installed a quicj change tool post on my G0752 lathe. With it came a cut off blade holder. It says I need to use a blade that is Parrellel top and bottom. Does that mean I can not use a T shaped blade in it or is that ok? Thanks for your time on this.

 

[killswitch505]

I’m kinda new if this is what you’re calling a T type blade I use it with my quick change blade holder without issue in fact it’s the best kind of parting blade I’ve used

 

[WarrenP]

I’m kinda new if this is what you’re calling a T type blade I use it with my quick change blade holder without issue in fact it’s the best kind of parting blade I’ve used

Yes that's the blade im talking about, I like them too, but not sure since the manufacturer says to use a parrellel top and bottom blade if it is ok to use this on my holder. Hopefully someone can answer this... Thanks.

 

[Nogoingback]

Those parting tools can be used in the typical QCTP holders, but benefit from a shim betwwen the lower half of the blade and the toolholder. This will keep the tool square to the face of the toolholder, as well as the work. I used a small feeler guage on mine, but anything of the correct thickness will work.

 

[MSD0]

Yes that's the blade im talking about, I like them too, but not sure since the manufacturer says to use a parrellel top and bottom blade if it is ok to use this on my holder. Hopefully someone can answer this... Thanks.

The top and bottom are parallel.

 

[killswitch505]

Yes that's the blade im talking about, I like them too, but not sure since the manufacturer says to use a parrellel top and bottom blade if it is ok to use this on my holder. Hopefully someone can answer this... Thanks.

I’m sure we’re using the same tool holder. I run the T type without any issue. The only time I’ve had any issue was setting tool height, that was before using the T type blades once I figured that out parting went from being a nightmare to being just another task.

 

[WarrenP]

OK, sounds good, I will shim the cutoff blade and all should be good (after I get one). Thanks all for the replies. Warren

 

[benmychree]

I use T type blades in my ordinary Aloris tool holder all the time with no problems and no shims; Having said that, I think it would be a good idea to relieve the tool holder in the area of the projecting side of the T. Another thought; ordinary parting blades are tapered top to bottom for clearance, but the holders such as the Aloris do not attempt to match that angle.

 

[9t8z28]

Actually true Aloris parting tool holders do have a groove machined for the top of the T part of the blade. Every copy I have seen (including mine) do not have the groove cut into them. I did mill a groove in mine. It helped a little on the smaller width blades but they still want to twist sometimes

I use T type blades in my ordinary Aloris tool holder all the time with no problems and no shims; Having said that, I think it would be a good idea to relieve the tool holder in the area of the projecting side of the T. Another thought; ordinary parting blades are tapered top to bottom for clearance, but the holders such as the Aloris do not attempt to match that angle.

 

[ddickey]

Some interesting parting blades.
https://www.sommatool.com/catalog/pdf/Somma_Catalog-Cut-Off.pdf