So here is a small job I did for an automotive shop that was in need of some replacement knobs for their tire changing machine. The knobs the machine came with were plastic and the threads eventually gave out over time. The only replacement knobs available were the OEM ones. The stub thread for the knobs to screw onto was an odd ball 5mm x .80 pitch so buying better replacement knobs were hard to find. I spun 4 knobs out of aluminum in hopes that they will last longer. For those of you who may have struggled with the title of this posting I am using DOB as “date of birth”. Was that one stetching it? Hey give me a break ok? It rhymes.
My main motivation for machining them was purely selfish. I had recently upgraded some lathe tooling and was now the owner of a new indexable cutter. I shelled out some dough for a Sowa .500” SCLCR tool holder part #146-784 and outfitted it with a CCGT-AP 146-024 carbide cutter. I was itching to give it a go. The cutter cuts like a hot knife through butter. I was giggling the whole time I was using it.
Anyway…I thought I would do this post up as a play by play and throw my methods out to the masses for criticism. The following is a picture post showing the steps I use to machine knobs. Please remember I AM NOT A MACHINIST, I figure things out as I go. If I am doing something wrong I am not surprised however I would love to hear about it.
Keep in mind that on this blog posting, as it is with all my postings, you can click on the images to get a full size view.
Let the show begin.