FlatBeltBob
Stainless
- Joined
- Jul 22, 2007
- Location
- central WI
In all my years I have never had to make a double start thread until now .
Now my old planer stripped the cross nut and work is stacking up .
I need to get this fixed fast !
The nut is a brass insert that has 1 1/8- 16 OD threads- thats the easy part .
Cleaned up the screw and found out it is a 3/4" -2 1/2' double thread .
( measured 2", counted 10 thds , so 10/2= 5/2=2.5tpi )
my lathe will cut 2.5, but how do I get them to start 180 deg apart?
Is this something as simple as engaging opposite marks on the chasing dial ?
I have a choice of my newer china lathe , or an older "Advance" American iron.
The Advance has a lever to disengage a 4 way coupling that drives the lead screw.
Is this the key to re sychronize opposing thread starts ?
Cut a few passes , stop , disengage dog clutch , roll by hand to get opposite dogs ?
Thanks ,
FBBob
Now my old planer stripped the cross nut and work is stacking up .
I need to get this fixed fast !
The nut is a brass insert that has 1 1/8- 16 OD threads- thats the easy part .
Cleaned up the screw and found out it is a 3/4" -2 1/2' double thread .
( measured 2", counted 10 thds , so 10/2= 5/2=2.5tpi )
my lathe will cut 2.5, but how do I get them to start 180 deg apart?
Is this something as simple as engaging opposite marks on the chasing dial ?
I have a choice of my newer china lathe , or an older "Advance" American iron.
The Advance has a lever to disengage a 4 way coupling that drives the lead screw.
Is this the key to re sychronize opposing thread starts ?
Cut a few passes , stop , disengage dog clutch , roll by hand to get opposite dogs ?
Thanks ,
FBBob