Flathead_Dave
Member
- Messages
- 325
I've always taken it for granted,as most people do,that if you cut a metric thread with an imperial lead screw,you have to keep the half nut engaged.
This guy uses a method where you can disengage the half nut.He engages it on #1 on the dial,takes a cut,then disengages the nut as he stops the lathe.
As long as the dial does less than one turn,he can reverse the lathe and pick up #1 on the way back.
When it gets back past the start,he stops it,puts on a cut,then runs it forward.As long as it was reversed back enough,it will take out any backlash before it starts cutting.
The first part of video is setting the gear train,he starts to explain the method around 15.30 and you get a view of what the dial is doing around 23.20.
I assume you can do the same when cutting an imperial thread with a metric lead screw.
How about a doubleboost demo John?
This guy uses a method where you can disengage the half nut.He engages it on #1 on the dial,takes a cut,then disengages the nut as he stops the lathe.
As long as the dial does less than one turn,he can reverse the lathe and pick up #1 on the way back.
When it gets back past the start,he stops it,puts on a cut,then runs it forward.As long as it was reversed back enough,it will take out any backlash before it starts cutting.
The first part of video is setting the gear train,he starts to explain the method around 15.30 and you get a view of what the dial is doing around 23.20.
I assume you can do the same when cutting an imperial thread with a metric lead screw.
How about a doubleboost demo John?
