Posted: Tue Aug 02, 2011 12:27 pm
Yeah yeah, I'm cycling it from the sun to the shade. With this weather, a solar oven is starting to look like a good idea...
Page 9 of 9
Posted: Tue Aug 02, 2011 12:48 pm
If you get into large epoxy casts you will also have to deal with the heat put off by the epoxy curing, I have had marine epoxy burn away the mold and ruin everything.
Posted: Tue Aug 02, 2011 3:47 pm
How big was the object you were trying to cast?
Posted: Tue Aug 02, 2011 4:32 pm
3.25" piston message too short
Posted: Sun May 20, 2012 3:33 pm
Build log, I revive you!
Back home for the summer, parts have been ordered. I found an old NPT spark plug on ebay and ordered adapters to attach it to the chamber. Parts will arrive by June 3<sup>rd</sup> at latest.
I'm also going to scrap the current piston in favor of an Fnord-based design, which I hope will be posted soon. There may be issues with o-ring blowoff, which seems to be the only drawback.
Just a quick question, if anyone knows: Do I require a TiN-coated bit to drill through SS, or will one of these cut it?
Back home for the summer, parts have been ordered. I found an old NPT spark plug on ebay and ordered adapters to attach it to the chamber. Parts will arrive by June 3<sup>rd</sup> at latest.
I'm also going to scrap the current piston in favor of an Fnord-based design, which I hope will be posted soon. There may be issues with o-ring blowoff, which seems to be the only drawback.
Just a quick question, if anyone knows: Do I require a TiN-coated bit to drill through SS, or will one of these cut it?
Posted: Sun May 20, 2012 3:49 pm
You can drill into SS with a standard HSS bit, just lower the cutting speed in order to keep your drill cool enough. Using cutting fluid is also a good idea.
Posted: Mon May 21, 2012 2:07 am
yeah HSS is fine some Trefolex makes it heaps easier.
Posted: Mon May 21, 2012 4:58 am
But spending the extra $40 and buying a set of cobalt bits is so worth it. I wouldn't buy HSS bits again unless I was flat broke.
I don't have a set of cobalt bits, just a couple, and when I'm not broke, I'll buy a full metric set.
And good to see you back Saefroch.
I don't have a set of cobalt bits, just a couple, and when I'm not broke, I'll buy a full metric set.
And good to see you back Saefroch.
Posted: Mon May 21, 2012 8:33 am
I have a set of standard english sized TiN coated bits, the one I'm buying might be a one-time use, being such an exotic size.
Thanks for the welcome back!
Thanks for the welcome back!
Posted: Mon Nov 26, 2012 10:18 am
Update!
Now at college, with access to a machine shop. I've worked out and got parts for a fueling rig and a pressurized pilot system. Now I'm just having an inner debate... For the end of the piston that has a diameter just slightly less than 0.5... Do I machine my own seal or stretch an undersized o-ring?
Now at college, with access to a machine shop. I've worked out and got parts for a fueling rig and a pressurized pilot system. Now I'm just having an inner debate... For the end of the piston that has a diameter just slightly less than 0.5... Do I machine my own seal or stretch an undersized o-ring?
Posted: Wed Nov 28, 2012 4:31 pm
Day 1 of machining done, pump cylinder reamed to 3/8", and pump rod almost to exact size (~0.002" left on it).
Tomorrow should see a finished small high-pressure pump.
Tomorrow should see a finished small high-pressure pump.
Posted: Thu Nov 29, 2012 11:47 pm
Day 2 of machining, good progress. New pump completed, 3/8" diameter head, 12" stroke:
Sorry for the terrible picture quality, all I have at school is my cell phone. The weld is not mine.
I've also discovered that if I ask nicely, the school will pay for my raw materials. The machinist here is ordering a piece of steel for me to machine a new valve body. No epoxy this time.
Sorry for the terrible picture quality, all I have at school is my cell phone. The weld is not mine.
I've also discovered that if I ask nicely, the school will pay for my raw materials. The machinist here is ordering a piece of steel for me to machine a new valve body. No epoxy this time.