In researching materials to construct a fuel tank for an off road motorcycle I've been made aware that standard PP and PE have too high a surface resistance and therefore store static electricity. Very special grades are available (tho not in small volume) with resistances of half or less than...
Im trying to make a part of which common pourable RTV silicone is ideal as it needs to be cast. Only problem is it must be reasonably fuel (gasoline) resistant which all RTV's I've tried are not.
It's doesn't need to be silicone. Any rubber about 30 Shore hardness will do.
Thanks.
Is there a tig torch with variable amps adjustment 'on the fly'? I'd be interested in your thoughts if you have used them. I'd like something small and compact for sub 70amps work, mostly steel and stainless. I dont care for pedals at all.
I am constructing a small oxy/acetylene fired vacuum furnace for 1Kg steel melts. I need a cylinder around the crucible which will be the wall of the vacuum chamber. The cylinder will be a diameter of about 3" by 4" tall and must be good for about 2000C/3600F. I can tune the burner so it is a...
Hello,
Im trying to work out what the temperature increase of a vessel full of water at 90 degrees C (194F) at atmospheric pressure after it is compressed to 10bar(145PSI) ?
Can anyone point me to a simple chart or formula to show this relationship?
Thanks.
Hello,
I am using a PID (Omega Cni16D22) to control a 30amp solid state relay for a motor. I've not used SSR's before and assumed they were the same as mechanical relays with respect to connections.
The output of the PID is also a SSR (internal) so I wired it such that the output would 'switch'...
I cant seem to find much info regarding home-brew teflon coating which I figure means it probably wont be easy at least. This would be a damn handy this if it could be done. Can anyone shed any light on the process/equipment required? I have high vacuum if that helps...
Hello,
I require a liquid to use as a barrier over some very reactive metal elements to avoid oxidization. I would now like to try polymers. Any suggestions for a highly inert liquid polymer (at room temp)? Halocarbon oil sounds like a start......
Hello,
After repair work to fire protection pipe work we would like our techs to use a portable compressor to pressure test the system with about 100kPa of air before re-charging with water. It should be a quick indicator of ends accidently left open and large audible leaks.
The pipe work...
I am having trouble finding safe replacement liquid for mercury. As I am using it as a switch contact it must be a good electrical conductor and liquid between 0 - 50 degrees celsius. I reqire about 1 litre per year.
Thanks.
Delrin AF (15% PTFE filled delrin) is often used (tapped)to make nuts for precision metal leadscrews on small mills and lathes. Would it not be best to simply use pure (teflon)PTFE? What about UHMWPE? Its apparently has similar properties to teflon but less resistant to abrasion.
The goal is...
I would like some suggestions on a good anti friction additive to epoxy. I will replace my hobby mill's brass leadscrew nut with a 'cast in place' nut directly on the leadscrew. This is not a new idea. It is a very effective easy way to virtually eliminate backlash.
I've read that graphite...
Hello,
I would like to build a router table top out of self leveling concrete. Is it simply a matter of using plain ordinary cement and thinning it down the required consistency to pour? Also, to make a table say 4 foot square and 1.5 inches thick (I need it heavy) should I cast the main slab...
I built my woodheater to heat my house and it has performed well for many years, however it requires repair. While it's offline I would like to implement some upgrades to gain efficiency. Glass door style woodheaters like this tend to only burn 'completely' and efficiently when the conditions...
Hi. Im looking for a solution to clean creosote of ceramic tiles. Cant use abrasives or scrape it. I am able to soak them for days if required.
Will caustic soda work?
Hi, I have struggled with this problem for many years now and Im almost ready to conceed defeat...
I want to generate aprox 12 amps @ 12VDC average from my dirtbikes for a powerful headlight (3 50W halogens). At least 5 Amps at idle. I can easily generate say 10 amps at 12V even at idle by...
