Thanks rq3, A local supplier had Nickel plated copper in C18150 (coefficient of thermal conductivity (k) ~ 324Wm-1K-1 at 20oC) at around 12 euro each delivered. C18150 is the alloy used in soldering irons. At the price, I bought one to trial. For comparison: Pure copper (Cu11000) has a k value of around 400 at room temp, with pure silver being 440 at room temp. At a guess, the aluminium usedby Andrew_F - Tech-Talk
This got me thinking.. Oxidation would be a problem on a copper block. Does anybody make/sell a nickel-plated copper heat block? Plenty of brass ("hardened copper") ones for sale on eBay, but brass and aluminium have similar thermal conductivity, so, aside from appearance, there would be little difference. Pure copper (Cu11000) and Silver have similar thermal conductivity A Nickel plated coby Andrew_F - Tech-Talk
No need to reply Mike. I just saw those projects you're working on - reminds me of the research I used to do. Intriguing. The z height sensor could be commercialised. I like the way you think. Regards, Aby Andrew_F - Tech-Talk
Hi all, I'm resurrecting a XYZ DaVinci as a RepStrap machine. I bought it for USD15 without a hot end, virtually unused. The proprietary 'bearings' allowed 1mm slop vertically in the X and Y direction, with the head mount wobbling uncontrollably. Background and info at end of post. I am familiar with Arduino and C++. (trained industrial engineer - process engineer / metallurgist as well as tby Andrew_F - RAMPS Electronics
Cheers Mike, Be interesting to see how it goes. Speaking off the cuff without pulling out a copy of Perry's. The air will be heated by the compression needed to get it to 6 bar unless you are compressing off line and holding it in a reservoir (assume you are thinking this instead of a direct piston pump). If you are putting energy into compression, then immediately decompressing it, I have a sby Andrew_F - Tech-Talk
... or you could just use the standard PTFE tube with the olives. It's unlikely to be under 10 bar pressure it the end of the tube is open (maybe 1.1 bar absolute at the fan,) and heat resistant if it hits the nozzle by accident. I might be wrong, however. Regards.by Andrew_F - Tech-Talk