Caliper depth bridge (Mitutoyo 500-181-30 CD-15APX)

I needed a depth measuring bridge for my Mitutoyo (500-181-30 CD-15APX) caliper. Because the original one is expensive I design my own.

There are a lot of bridges out there to print, but I wanted a design which is adjusting the caliper to the side automatically. This is achieved (as on the original part) by the cone on the thumb screw. I expect the cone to wear out after some use because the caliper is from metal. For now it suits me well.

Take a look on the images and the technical drawing for details on the assembly. 

BONUS: It fits in the caliper box :)

I would be happy to see some of your makes posted :)

Tips for use:

• The zero-offset on this bridge I was able to achieve is between 0,01-0,02mm. This can be compensated by zero-ing out the caliper on a flat surface.
• I recommend to print the “large” screw because it is easier to turn. But a smaller screw model is provided.

Print instructions:

• No supports
• Part is mostly optimized for 0,3mm layers
• Print with 4+ walls to give enough material for the threaded inserts

Additional parts needed:

• 2x M3 threaded insert (l=5,7mm d_out=4,6mm), short insert possible
• 1x M3x20 hex screw

Assembly:

• Mold the inserts in the bridge part.
• Mold the insert in the thumb screw part.
• Remove excess plastic while it is soft.
• Put the M3 screw tight in the thumb  screw part.
• Screw the thumb screw in the bridge.

Source files in the Alibre Atom format is available but the website does not allow the upload. If you need it send me a message.