making spring cut off / parting tool holder

[@KereaktifEngineering]

My design this time still requires more rigidity.Maybe later there will be an updated version that is more perfect and more rigid

[@robertocostanzi9165]

Excellent accessory, I would say indispensable

[@Asaadomar]

Make the tip square. Spring mechanism should prevent it from catching.

[@dazaspc]

Most commercial spring style parting off tool holders pivot at least the blade height above the cutting edge. Usually 1 1/4 its height. When it vibrates it pushes it much further away. You dont actually want the spring action to play a part until it is overloaded. A razor sharp cutting edge and slow down the RPM. Set it slightly below center on the chuck side with the high side of the blade top edge 0.001~0.002" below center. High frequency vibration is the enemy. Then you should be able to load it safely and cut an easy 0.010" per revolution. Start out at the lowest RPM you have and then find the limit material wise as well as machine rigidity wise. Cross slide wear and lead screw wear play a huge part. However the way the cutting edge runs parallel wise to the spindle axis is also important for reducing the blade wander. If you have to run it fast rpm wise just get a carbide as they are not as sensitive to abuse.

[@KereaktifEngineering]

Thank you for your advice sir.I have another idea and maybe I will make it again. I plan to use high carbon steel as the base material

[@dscott1524]

Should the tool still be chattering? Is the pivot point a little low? Cheers.

[@KereaktifEngineering]

Maybe yes.My toolpost is very small so it has limited space to adjust the height especially with the shim system. In my opinion this is still not perfect, maybe I will revise the design

[@msr15334]

Just mount a regular tool upside down with reverse spindle rotation. It will cut much better and faster.

[@KereaktifEngineering]

that's hard to do because my toolpost is too small. if I install it upside down the cutter tip is too far from the center point.This is one of the disadvantages of mini lathe that way is possible if I change my toolpost.cheers

[@dazaspc]

A reverse parting off tool only works better when there is a significant wear difference in the cross slide lead screw.

[@user-lq2nw2pl7x]

​@@dazaspcشذذذذضذذذشش ذذذذذذذ مش ذ مش ذ شذ ذذشذ

[@ironmask5308]

The comments quickly separate the operators from the machinists.

[@mosfet500]

Reverse the spindle and grind upside down.

[@antongyrt4814]

Жёсткость станка храмает. Рапит, скорость не любит, под этот диаметр оборотов 80 надо.

[@TheMadJoker87]

its an interesting design, but it could use some more rigidity. altough i have to say it, what is the point of going trough all that trouble with the spring if you are gonna end up joining both sides with a screw on the back? it defeats the whole purpose

[@KereaktifEngineering]

Yes, actually, this isn't perfect, there are still a lot of things I need to fix, maybe next time I'll make it again with a different design.and what you mean by the bolt at the back is to prevent the holder from bending inward, not to connect it.Thank you for commenting cheers.

[@percyturpochipana6177]

catastrofico