Clausing 8520 draw bars

JPigg55

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I decided to draw up some dimensions of the original draw bar for my 8520 and the one that cam with the spare head I had purchased.
Though both will work with my mill, there are some differences as you will see in the pics.
General measurements were done with tape measure and digital caliper, thread pitch was measured with thread gage.

Draw bar that came with my mill:
original head copy.jpgoriginal head 2 copy.jpgoriginal bar threads copy.jpgdraw bar copy.jpg



Spare head draw bar:
Threads copy.jpgHead copy.jpgHead2 copy.jpgDraw bar copy.jpg



I also did measurments of the draw bar collar:
collar2 copy.jpgcollar copy.jpg


Curious to know why the difference if there is any.

draw bar copy.jpg original bar threads copy.jpg original head 2 copy.jpg original head copy.jpg Draw bar copy.jpg Head2 copy.jpg Head copy.jpg Threads copy.jpg collar2 copy.jpg collar copy.jpg
 
The one with the long square end is home grown. The thread on both is 3/8-16.

"Billy G"
 
I decided to draw up some dimensions of the original draw bar for my 8520 and the one that cam with the spare head I had purchased.
Though both will work with my mill, there are some differences as you will see in the pics.
General measurements were done with tape measure and digital caliper, thread pitch was measured with thread gage.

Draw bar that came with my mill:
View attachment 85081View attachment 85080View attachment 85079View attachment 85078



Spare head draw bar:
View attachment 85085View attachment 85084View attachment 85083View attachment 85082



I also did measurments of the draw bar collar:
View attachment 85086View attachment 85087


Curious to know why the difference if there is any.

I am curious why they chose square head instead of hex head. Wouldn't 3/8-16 all-thread work in a pinch? I setup Bridge Ports and their clones I don't recall setting up Clausings mills.

Thank you for the photos and measurements.
 
Bill, because of the measurement of only .250 across the flats would not make a hex head practical. You would break the corners on a regular basis. That is the reason for the square head on the drawbar.

"Billy G"
 
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