Any guidance please: I am trying to make a holder for a standard G4 capsule type halogen bulb (12v 20W). This is to replace a 6v 15W bulb in a gunlamp on my son's air rifle. The capsule lamps are cheap whereas the special bulb (6425 GBB )in the lamp costs £17.50.... hence the decision to expend hours of time to save a few quid!. (Anyway, we have several 12v batteries available, & no suitable 6v ) The catch is that this holder needs to fit inside the aluminium reflector assembly which I have salvaged from the 6425 GBB after removing the blown halogen insert. So, I can't use the standard 2 pin G4 type holder, 'cos it can't be machined to fit the back of the reflector. My Mark1 effort, made from some unnamed hardish plastic I had lying around, I was a bit dubious about since I know the halogens give off a lot of heat. It worked perfectly for 2-3 mins, when the light gradually reduced accompanied by melting plastic smells. The heat from the bulb had melted the holder & fumes filled the reflector. The holder is trivial to make: just a 13mm rod slightly tapered down to 12.5mm OD, with a 3mm slot
9mm wide & 10mm deep machined in the front face, then a couple of 2mm holes drilled from the back face to meet the slot. What do you all think of ally for this? Any easily available machinable ceramics? Could I use plaster of paris or similar & just cast the bulb in a female form? Would tufnol stand the heat any better ?----------------------------------------------------------- snipped-for-privacy@boltblue.com
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