Author Topic: Setting proper height of cutting tool on lathe  (Read 4485 times)

Offline Doc

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Setting proper height of cutting tool on lathe
« on: November 09, 2015, 09:17:44 PM »
Here is a short vid I did awhile back on setting tool height on your lathe.
https://www.youtube.com/watch?v=vpCu56O8AJ0&feature=youtu.be
George

Offline RotarySMP

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Re: Setting proper height of cutting tool on lathe
« Reply #1 on: November 10, 2015, 04:48:40 AM »
Nice clear video, simple idea. Thanks.

What do you use to set center height on a facing tool?
Mark

Offline Lew_Merrick_PE

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Re: Setting proper height of cutting tool on lathe
« Reply #2 on: November 10, 2015, 10:58:21 AM »
Here is a short vid I did awhile back on setting tool height on your lathe.

I was taught that "trick" in 1967 and it still works!  The next (and more permanent "trick") is to turn a shoulder rod (say .750 inch X .375 inch) and thread the .375 inch end (say) .3750-24UNF such that, when hung from the .750 shoulder just clears the bed of the lathe by (say) .125 inch.  A "nut" made from some of the .750 inch rod that is (say) .50 thick and squarely tapped (.3750-24UNC) is then thread-locked to the threaded end such that it will "hang" by a thou or so at that setting becomes an OD cutter height setting tool (and remember to mark that designation on the tool!).  The same thing a couple of thou of so taller (and appropriately identified) becomes your ID cutter height setting tool!

I cannot tell you how many of these setting tools I have made over the years nor how many times they have simplified my life!

Offline Arbalist

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Re: Setting proper height of cutting tool on lathe
« Reply #3 on: November 10, 2015, 12:23:09 PM »
I use a four way tool post so I've epoxied a suitable shim to the bottom of my insert tool holders so they're permanently on centre height. Most of my turning though us done with a Tangential tool so I made a centre height gauge for setting it. Only takes a few seconds to set the height after sharpening.


Offline Jonny

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Re: Setting proper height of cutting tool on lathe
« Reply #4 on: November 10, 2015, 04:04:48 PM »
Cant beat facing off by taking a cut to set tool height, eliminates machine and tool inadequacies as well.


Offline JD

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Re: Setting proper height of cutting tool on lathe
« Reply #5 on: November 11, 2015, 04:27:29 PM »
George I use the rule/scale method, quick and easy.
JD
If you cant fix it hit it with a bigger hammer

Offline awemawson

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Re: Setting proper height of cutting tool on lathe
« Reply #6 on: November 11, 2015, 04:41:03 PM »
Yes I've used the 6" ruler method for years and it works splendidly on a manual lathe.

My CNC lathe has a fancy optical setting up system that relies on a special jig putting in the VDI 30 turret, but I'm convinced that my jig is out of kilter (actually I have two and they differ so at least one is wrong). I'm going to have to work out how to re-set the jigs from first principles.

It would be SO much easier with a 6" ruler but it's all cabinet enclosed  :(
Andrew Mawson
East Sussex

lordedmond

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Re: Setting proper height of cutting tool on lathe
« Reply #7 on: November 12, 2015, 02:14:05 AM »
Andrew

that would be a FBH then that should do it  :) :) :) :) :) :)


Stuart

Offline mechman48

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Re: Setting proper height of cutting tool on lathe
« Reply #8 on: November 30, 2015, 08:27:06 AM »
Have used that method before but now stick with same method as Arbalist... take a facing cut & when no 'pip' left... dead on centre height  :thumbup:

George.
George.


Always look on the bright side of life, & remember.. KISS..' Keep It Simple Stupid'

Offline loply

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Re: Setting proper height of cutting tool on lathe
« Reply #9 on: November 30, 2015, 09:34:25 AM »
This method also works well for setting the tailstock - either put a dead centre in the spindle, or, turn a cone onto the end of some stock. Then squeeze the scale (or something like a stanley knife blade) between a dead centre in the tailstock and the one in the spindle.

Can be used for checking both vertical and horizontal offset.

Offline SteveT

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Re: Setting proper height of cutting tool on lathe
« Reply #10 on: November 30, 2015, 10:38:35 AM »
I always use the 6" ruler method, learnt when I was an apprentice long time ago :-)
Steven Tyrer
lives in Cardiff South Wales