- Joined
- Feb 9, 2017
- Messages
- 5,318
hi all,
I've just completed going through a new to me 7b. It was rescue I got in a barn sale. It had obviously not been used in possibly decades. After a thorough cleaning, a new start cap on the motor and a couple repairs to like the motor wiring, the tool post gib and the hub crank screw, and assorted stuck things, I was ready to make some chips.
I did a couple of passes on some aluminum I had. The finish is the best I've ever been able to achieve with any of my machine tools. But up careful inspection on the surface plate I noticed there is a pattern. The first 1/4" of the pass is crazy flat like within .0002 then there's very slight chatter then from there on there is up to .004 total wander. Even though it's still like a mirror finish. Needless to say this is puzzling.
As I was doing this I also started tightening up the gibs and rechecking. The one thing that I need to replace is the feed nut as it's definitely worn enough the internal threads are sharp, not good on a acme thread.
I'm wondering if the table foot is the culprit of the sudden aberration? It was stuck in the up position before I went through it and the bottom of the foot and the surface has some long scrapes from chips or dirt stuck between the surfaces. Do you guys use the foot on your shapers?
I've just completed going through a new to me 7b. It was rescue I got in a barn sale. It had obviously not been used in possibly decades. After a thorough cleaning, a new start cap on the motor and a couple repairs to like the motor wiring, the tool post gib and the hub crank screw, and assorted stuck things, I was ready to make some chips.
I did a couple of passes on some aluminum I had. The finish is the best I've ever been able to achieve with any of my machine tools. But up careful inspection on the surface plate I noticed there is a pattern. The first 1/4" of the pass is crazy flat like within .0002 then there's very slight chatter then from there on there is up to .004 total wander. Even though it's still like a mirror finish. Needless to say this is puzzling.
As I was doing this I also started tightening up the gibs and rechecking. The one thing that I need to replace is the feed nut as it's definitely worn enough the internal threads are sharp, not good on a acme thread.
I'm wondering if the table foot is the culprit of the sudden aberration? It was stuck in the up position before I went through it and the bottom of the foot and the surface has some long scrapes from chips or dirt stuck between the surfaces. Do you guys use the foot on your shapers?
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