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| A boring table for a Craftsman 12" lathe |
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| vtsteam:
The pattern needed to be coped down around the edges to the parting line. The riser is now in place, as is the tapered sprue dowel on top of the pouring basin. The sprue dowel has a small prass peg to fit in the basin. The arrangement is a bit tight -- it would be better in a bigger flask. I haven't cut gates yet. The pattern has been blacked with plumbago. |
| vtsteam:
I forgot to take more photos until after the pour. Here is the shake out. Pretty good casting, except for that big hole in the middle. It had sand in it and I think a bit of the greensand core had collapsed here. It's in a spot that won't interfere with the part build, and won't be visible in the final table but its a shame to have it mar an otherwise good looking casting. I decided not to re cast the table -- I want to move on with the steam engine project and I need this boring table to do that. |
| vtsteam:
Here is the table after roughing it in for further machining -- some minor flaws came to light besides the hole. These are shallow. This face of the table gets a steel plate over it. It will be the upper surface. The tee slots are made by slotting that plate. The recesses under are where the grooves are here. These will first be machined out square and to proper depth. I'll first fill the flaws with metal filled epoxy before machining. The table was machined with my homemade carbide cutter detailed elsewhere. Quite pleased with the job it does on rough castings. |
| vtsteam:
Not much time today, but filled flaws, milled the slots. and cleaned up ready to add the top plate. |
| ironman:
Years ago I made a table for my lathe. The only regret I have is that it was a total waste of time drilling and tapping all the holes, they are never in the right place when you what them. A far better idea is to drill the holes for every job. If you look closely at the table casting you will see slag inclusions and blowholes. The table was used to bore a steam engine cylinder between centres. |
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