Speed measuring instrument

A

A.Maro

New Member

• Mar 17, 2015

• #1

Building a circuit that measures speed. Any idea on how I can separate the shaft(ssensor) from the case. That is I don't want the casing to rotate with the shaft. Already thought of ball bearing but I want to use rubber case and can't afford to weld

 

jpanhalt

Well-Known Member

Most Helpful Member

• Mar 17, 2015

• #2

Please draw a diagram. I have no idea what you want to do. A simple weld cost me less than $0.01.

John

 

alec_t

Well-Known Member

Most Helpful Member

• Mar 17, 2015

• #3

A.Maro said:

Any idea on how I can separate the shaft(ssensor) from the case.

Click to expand...

Use a hammer and chisel, or oxyacetylene torch?

 

Joe G

Member

• Mar 17, 2015

• #4

I'd use babbit bearings instead of the ball bearings, but you will need to cast them and then scrape them for a slip fit of .001" to .004" depending on if the spinning shaft is made of a hard wood like balsa or a soft plastic like nickel????

 

Tony Stewart

Well-Known Member

Most Helpful Member

• Mar 17, 2015

• #5

Normally the Hall sensor is outside the shaft which only has a dimple, hole or slot.