Ivan B
Plastic
- Joined
- Apr 8, 2008
- Location
- Southern Brazil
I´m halfway in my shaper restoration, and I´m cutting a crossfeed screw (was missing).
All I had was the nut, and doing my best to measure it I concluded it´s a 0.5" 10tpi ACME screw.
I cut the thread as per specs (machinery´s handbook), tool ground to 29deg, set square and at center height, external and internal diameters correct.
Although the screw fits the nut, it just doesn´t feel right. It starts very loose, and when it´s almost thru the nut it becomes tight (it´s the same threading from both ends of the nut). Still, I´m able to slightly tilt the screw inside the nut.
It gives me the impression that there are very few contact points between the screw and the nut, as if there was a slight pitch error or a thread angle error.
Would another SB7 shaper owner be so kind to confirm this thread specs? Is it really 0.5in, 10tpi and ACME form?
All I had was the nut, and doing my best to measure it I concluded it´s a 0.5" 10tpi ACME screw.
I cut the thread as per specs (machinery´s handbook), tool ground to 29deg, set square and at center height, external and internal diameters correct.
Although the screw fits the nut, it just doesn´t feel right. It starts very loose, and when it´s almost thru the nut it becomes tight (it´s the same threading from both ends of the nut). Still, I´m able to slightly tilt the screw inside the nut.
It gives me the impression that there are very few contact points between the screw and the nut, as if there was a slight pitch error or a thread angle error.
Would another SB7 shaper owner be so kind to confirm this thread specs? Is it really 0.5in, 10tpi and ACME form?