skotl
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- Edinburgh, UK
So I've learned that on my ancient lathe with an imperial leadscrew, I really need a reversible motor to do (metric) threadcutting.
That was last weekend's job - motor is now reversible
Then I did a bit of reading / viewing on screwcutting (never done it before) and particularly enjoyed ToT's video "Another Thread Cutting Video?" which made a lot of fuzzy topics clear to me.
I then put it into action with the pretty-obvious results: billions of very fine threads all running into each other
Tony was recommended that the cross slide be zeroed in and then use the top slide at a 29.5 or 30 degree angle, as can be seen in the video at around 21:45
So last night I went out and tried it again and it become obvious to my feeble brain that if I'm advancing the top slide at ~30 degrees, then it's moving to the left for every advance forward I'm making. That would explain the thread moving up the bar.
Have I totally misread/misheard this, or am I just Doing It Wrong(tm)?
That was last weekend's job - motor is now reversible
Then I did a bit of reading / viewing on screwcutting (never done it before) and particularly enjoyed ToT's video "Another Thread Cutting Video?" which made a lot of fuzzy topics clear to me.
I then put it into action with the pretty-obvious results: billions of very fine threads all running into each other
Tony was recommended that the cross slide be zeroed in and then use the top slide at a 29.5 or 30 degree angle, as can be seen in the video at around 21:45
So last night I went out and tried it again and it become obvious to my feeble brain that if I'm advancing the top slide at ~30 degrees, then it's moving to the left for every advance forward I'm making. That would explain the thread moving up the bar.
Have I totally misread/misheard this, or am I just Doing It Wrong(tm)?