2015 POTD Thread Archive

Foundry work is hot work, eh Peter? Cool footwear is a must.
 
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Very disturbed to see MozamPete's (lack of) foot ware. Even more disturbed that others make light of his foolishness. I guess you'll just post a prayer request after the incident (not accident) he's begging for.
 
Extropic, It is possible you've misinterpreted levity as a lack of concern.
 
extropic said:
Very disturbed to see MozamPete's (lack of) foot ware. Even more disturbed that others make light of his foolishness. I guess you'll just post a prayer request after the incident (not accident) he's begging for.
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Risk assessment deamed it a low risk for this operation as I wasn't moving anything hot - the iron was just heated up and cooled down in the forge. In my opinion less risk than cooking a roast in the kitchen. Now when it come to casting aluminium that will be totally different boots, apron, full face shield.
 
markknx said:
Peter, Love that forge I have to crack down and build one. Am I right thinking that is an LP (propane) tank? looks like the ones they use on a fork truck. You mentioned sealing it so the rail could cool slow what are you using on the top? Any way that is nice. what's the plan for the rail? a anvil? If so would love to see pics of that when your done.
mark
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It was a 14kg LPG tank and cut into three sections so I can reduce the size. Normally I expect to just use the top and bottom section and will make a crucible that suits that size for casting aluminium - which was the primary purpose for building it.
Lining is two layers of 25mm ceramic wool blanket - in the photos I'm using a off cut on top to reduce the exhaust hole size to limit heat loss as the actual hole in the top has been designed as a charge hole for feeding the curcible.
Once it had got up to heat I just turned off the gas and put some more ceramic blanket off cuts on top with a brick to hold them down. Had a peak about 30 minutes into the cool down and the iron was still glowing red.
And yes, end result should me a mini anvil.
 
Well the annealing appears to have went well and the railway track machined very nicely now.

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Now to take to the nose with the grinder
 
That's going to be an awesome anvil, Peter.

Here's what I did today. These are chin rests for a rig that holds people's heads in position for photographing their hair diseases.

They are made of 3/4" Delrin.

I made the dished cut with a modified 3/8" carbide cove router bit. I had to mill off the bearing stud in the middle. I then chucked it in my mill and made the passes .26" both directions from the center.

Then I used my new facing mill to mill off the planer chatter marks on the faces of them and gang clamped them on edge in the mill vise to clean the saw blade marks off the edges and bring them to exact matching size. Dimensions were not critical, they just needed to be the same.

I used my router table and a 1/2" round-over to round the ends, then a 1/8" round-over to soften the top edges.

I was duplicating a Canfield part with some freedom of design. The Canfield chin rests also had the swirl marks at the bottom of the cut, so I'm ok with 'em. Besides, I couldn't figure how to remove them. Sanding Delrin does not produce very slick results, and they need to be slick for hygenic reasons.

chin rests final_0380.JPG
 
Franko, nice job, I like to play with plastic some times.
Mark
 
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