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Aestus57:
 :smart:

I was browsing Tubal Cain's videos the other day and noticed that all his lathes had the topslide swung round at an angle, which got me thinking why??

I first thought that it was just to get it out of the way of the tailstock but then with a flash of inspiration I realised that having it swung round to 30 degrees would be very useful indeed.

Suppose you were turning a piece down to 0.250" and after getting close measured with a micrometer at 0.262" i.e. 12 thou oversize, put a cut on of 12 thou with the topslide and you would get a movement of 6 thou at the tool tip because Sin 30deg = 0.500 X 12 = 6 thou.

No more having to divide measurements by 2 to put the right amount of cut on.

Yes I know its simple..... but so am I..... and you all probably knew this already.... but it never occurred to me before!!!

 :doh:

Jonny:
Not much good when working to exact lengths, lose zero.

Many decent lathes cross slide markings are for diameter so no need to halve.

Some like to thread cut that way.

Powder Keg:
It should actually be set at 29.5 degrees. That way the back of the tool doesn't rub when you feed in. And lathes come with both direct and indirect reading dials. I like to thread cut with an indicator on the crosslide. I'll try and post a picture of my setup and my threading chart. An old friend gave me the chart. I haven't seen one like it before.

~Wes~

WillieL:
Any luck on that picture and chart yet Wes?
Enquiring minds want to know.

Powder Keg:
Sorry, Been pretty busy. I need to thread a couple parts on my Penny. I'll take good pictures of my setup and post the chart then. Thanks for your patience:o)

~Wes~

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