Picture of Machining replacement tips for Harbor Freight spot welder
The contact points of our Harbor Freight spot welder had gotten too pitted and damaged to work.  I had no luck getting replacement parts from anywhere, so I made a replacement set.  I used TechShop San Jose's lathe to make the parts. 

Step 1: Load copper rod into lathe with collet closer

Picture of Load copper rod into lathe with collet closer
I bought a nice copper rod from McMaster-Carr - it wasn't cheap, but it was less costly than a new spot welder.  The piece was 3/4" in diameter, so I used a 3/4" collet to hold the rod. 
WillH82 months ago

I found replacement parts by calling Harbor Freight. Here's the info

The part you are requesting can be ordered by contacting our Inbound Sales department at 1-800-423-2567. They are available 24 hours a day 7 days a week.

SKU# Part# Description Price (plus tax & shipping)

15551 24 61205/61206 ELECTRODE TIP 2PK $15.99

scarr27 months ago

This is a great project and you obviously put a lot of thought and craftsmanship into it. FYI AK-builder.com does sell new tips for the HF spot welder. Good job though!!!

mackamitsu1 year ago
you can file a pair of flats on the tip to use a wrench if you want.
klee27x1 year ago
I'm curious. Do you buy taps individually, where and when you need them for specific tasks? Or did you buy a complete set of them up front? Or do you find there are a few key sizes that are your go-to's that cover most of your needs? If yes to the latter, which are your most frequently used taps?
BradMartinson (author)  klee27x1 year ago
I have usually invested in full sets of taps over the years - a nice combo metric & SAE set has kept me company for about a decade now. Craftsman brand, as I recall.

However, for this project, I was able to use the ones at TechShop San Jose to do the job -- they have a complete set available for member use.
Great job!
Great job!