I would like to try casting too. Maybe i will in the future. A nice set of aluminium barrels for the triumph would be nice.
I made some engine adapters, the foundry use the setting sort of sand[forgotten what they called it] for the core, They fill
the core box then squirt CO2 though and it's solid, I was impressed. Was the stuff you mixed with the sand sodium silicate?
I keep meaning to have a go at casting. I have a Sunbeam head that could do with something like 13 fin repairs. Nice new head maybe?
Could I see larger pics of the pattern and as you do it?
I took a resin print from both and combined them on a board to make the best out of both to be used as a pin located greensand pattern.
I believe the difficult thing with pattern making, which is a trade in itself, is making the pattern slightly larger to take into account metal shrinkage.
Feel free to correct me if I'm wrong but if you've took a print of an existing head and used that to make a pattern won't the resulting cast item be slightly smaller than due to metal shrinkage as it cools once it's been poured ?Pattern moulded first time. Well pleased with it. Ran out of time to actuLly get the furnace on but will do next Friday. Fingers crossed
You need to becareful using a bottle jack that you dont deform or even crush the tube. Its easy even with a push through bender to deform the tube.I need to bend the down tube so the frame mount lug at the bottom moves out by 1.5".
I want the bend to form a gentle curve over the length of the tube.
What method would people recommend?
I don't want to dismantle frame.
My thought was to make up jig to hold the tube at either end in board if the lugs and have a captive bottle jack exert pressure on the centre of the tube.
Basically like those machine mart tube benders.
Thoughts?
You need to becareful using a bottle jack that you dont deform or even crush the tube. Its easy even with a push through bender to deform the tube.
Id suggest you borrow a die set from a bender hen gently use your jack. You could heat the casting, remove the tube, then re braze it back in. But dont forget be bending you will lift the mounting point slightly.