The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Brian Rupnow:
My small mill did not enjoy cutting this 1144 stress proof at all -at all. This stuff cuts much harder than mild steel or brass. Poor mill was shaking and quivering, and I could tell that I was hurting it. I did cut all the way round, and I did get the right number of teeth, but I think all the shaking and shuddering may have thrown the 3 jaw chuck out of center, as the teeth on one side are deeper than the other, and the tooth form is off. I will center up the 3 jaw on the rotary table and see if I can re-cut this gear and save it. So---A lesson learned here. If you have a small mill and not a full size Bridgeport or equal, you probably shouldn't use 1144 stress proof for gears.
Brian Rupnow:
It seems the day is saved!!! I tore everything down re-centered the chuck on the rotary table (it was about .008" total runout), then set everything up again, eyeballed to make sure I was cutting in a space, not on a tooth, and went around again--all 30 spaces. Gear now looks good, all teeth are the same height and same shape. I will know better when I get all the gears made and mounted, but I think it's going to be okay.
Stilldrillin:
--- Quote from: Brian Rupnow on August 11, 2014, 07:21:51 PM ---It seems the day is saved!!! Gear now looks good, all teeth are the same height and same shape. I will know better when I get all the gears made and mounted, but I think it's going to be okay.
--- End quote ---
It's a good feeling. When a wonky component can be easily salvaged.
Especially, when only you know....... :thumbup:
David D
Brian Rupnow:
David--That's why I keep all my failures a secret and never let anyone know about them :doh: :doh:
Brian Rupnow:
Old age and treachery triumph once again!!! The gear has now been split and finished and mounted on two 3/8" diameter dowels mounted in two reamed holes exactly 1.25" apart (The pitch diameter of the gears)---They mesh perfectly. Hurray for my side!!!
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