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Thumb Roller Hook for Dial Caliper

by scorch, published

Thumb Roller Hook for Dial Caliper by scorch Oct 15, 2011

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Description

This is a replacement part for the thumb roller hook that broke on one of my dial calipers. I made the part by injection molding polypropylene. I included the model files used to make the aluminum mold.

I don't know how often these things break but I couldn't find a direct replacement for mine. I did see some company selling a similar part that might have worked for ~$8. I think I bought the caliper for about $15.

Additional information about my injection molding process can be found at home.comcast.net/~sskroch/Injection_molding/injection_molding.html

Recent Comments

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Polyurethane (e.g. from Smooth-On) can be done nicely on a budget - I shoot the liquid pre-polymer in to the mould with a syringe (cut the threaded shell portion off the luer lock and mill the gate to fit the luer tightly) and it works well.

Nice work, always wanted my own injection molder, not got around to it yet :)

I have that exact same caliper . . . .

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License

Public Domain
Thumb Roller Hook for Dial Caliper by scorch is licensed under the Public Domain license.

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Instructions

I used a CNC mill to make aluminum molds and injection molded polypropylene to make this part. The model is designed so that the mold can be milled with a 1/16 end mill. I used a Dremel 1/16 carbide grout removal bit for the bottom half mold because my standard length 1/16 end mill was not long enough. I used a 1/16 ball end mill on the top side to make it look nicer. The models for the molds do not include the gates for injecting the plastic. I milled the gates in manually after the main section of the mold was made.

Comments

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andrewar on Oct 16, 2011 said:

Nice work, always wanted my own injection molder, not got around to it yet :)

MarkU on Oct 17, 2011 said:

Polyurethane (e.g. from Smooth-On) can be done nicely on a budget - I shoot the liquid pre-polymer in to the mould with a syringe (cut the threaded shell portion off the luer lock and mill the gate to fit the luer tightly) and it works well.

PhillyDee on Oct 16, 2011 said:

I have that exact same caliper . . . .

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