- Joined
- Oct 7, 2020
- Messages
- 2,133
I purchased an MT5 test bar made in USA. It was advertised as "Each piece is inspected for concentricity within 0.0001”
After installing it I'm not sure what I am looking at. I don't thing bar is concentric. I'll try and explain without a video, hopefully the photos will be enough.
I first checked the concentricity for my spindle. With my dial indicator zero run out.
On one side of the bar, I zero the indicator and without spinning the spindle I move to the tail stock end. It still reads zero or very close. For this test I think this indicator is going to be close enough.
Now at this point when I spin the bar 180° it almost 2 thousand out. And if I move back to the head, it doesn't come back to zero it is still 1 thousand out.
I hooked up two indicators, I can't say that I have a handle on it yet. My thinking is the bar is the problem. Why would one side pretty much be straight and then when I rotate it 180° it reads off.
I zeroed both indicators at the spindle then move to the tail stock end, about .5 thousand off maybe.
Rotated the shaft/spindle 180° and the indicators read 2 thousand out. Move back to the spindle and they both read about 1 thousand out.
Without rotating the spindle again, I zeroed the indicators and moved back to the tail stock end, they read 1 thousand out. What am I missing? By the way I marked the bar and the spindle with a felt pen and then rotated the bar to different locations in the spindle I can repeat all these measurements on the bar at the same locations.
Acugauge MT5 Lathe Alignment Test Bar, Length 17-1/2 in. + Hooray, Your Item is in The US, not in India!: Amazon.com: Industrial & Scientific
Acugauge MT5 Lathe Alignment Test Bar, Length 17-1/2 in. + Hooray, Your Item is in The US, not in India!: Amazon.com: Industrial & Scientific
www.amazon.com
After installing it I'm not sure what I am looking at. I don't thing bar is concentric. I'll try and explain without a video, hopefully the photos will be enough.
I first checked the concentricity for my spindle. With my dial indicator zero run out.
On one side of the bar, I zero the indicator and without spinning the spindle I move to the tail stock end. It still reads zero or very close. For this test I think this indicator is going to be close enough.
Now at this point when I spin the bar 180° it almost 2 thousand out. And if I move back to the head, it doesn't come back to zero it is still 1 thousand out.
I hooked up two indicators, I can't say that I have a handle on it yet. My thinking is the bar is the problem. Why would one side pretty much be straight and then when I rotate it 180° it reads off.
I zeroed both indicators at the spindle then move to the tail stock end, about .5 thousand off maybe.
Rotated the shaft/spindle 180° and the indicators read 2 thousand out. Move back to the spindle and they both read about 1 thousand out.
Without rotating the spindle again, I zeroed the indicators and moved back to the tail stock end, they read 1 thousand out. What am I missing? By the way I marked the bar and the spindle with a felt pen and then rotated the bar to different locations in the spindle I can repeat all these measurements on the bar at the same locations.