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| Lew_Merrick_PE:
Bertie -- Just remember that the 3rd Law of Thermodynamics clearly states thatchaos wins! ;-) |
| bertie_bassett:
right well im a bit calmer now. food and drink has helped iv no idea how im going to re-do/salvage this crank though, I think I should have gone with my original plan of locktight. but it may be too late now |
| vtsteam:
Notice the sig! |
| Manxmodder:
--- Quote from: bertie_bassett on June 03, 2015, 03:35:48 PM ---right well im a bit calmer now. food and drink has helped iv no idea how im going to re-do/salvage this crank though, I think I should have gone with my original plan of locktight. but it may be too late now --- End quote --- Hi Bertie, sorry to see this go bad for you,but as you have already said I think the retainer grades of Loctite or Trulock are probably your best bet. Silver soldering small crank assemblies is often a difficult and somewhat hit and miss process. If 'Stilldrilling' AKA David sees this he may be able to offer you some useful advice on the subject of crank assembly. He is a master of these techniques. What I can offer is my recent experience in building a crank for a Beng's little Nick flamelicker. The build notes recommend that the crank is soft soldered,but expressly warns against high temperature silver soldering as distortion is very likely to occur. As it happens,I did neither and went with the loctite retainer adhesive method,which seems to have worked very well......OZ. |
| bertie_bassett:
well iv slowly been making progress with this managed to dismantle the crank and rebuild using jbweld. I didn't fancy my chances of cutting the waste out without damaging the bearings, so made it in sections. i used a a pair of matched vee blocks against a bit of bar to hold everything in line whilst the glue set and with a bit of fettling i ended up with this gave it a test run but no joy :( it did 'try' a little with ice on top and the base very hot but nowhere near enough and the whole lot just got hot. also i must have got the crank round the wrong way as it wouldn't even 'try' going forward :Doh: seems im still having issues with that graphite shaft gland, despite being drilled perfectly centrally and polishing the displacer shaft to a lovely sliding fit it just wasn't right. i suspect it was too soft as it seemed to be wearing oval and allowing the shaft to wobble thus causing excess friction as well and tilting the displacer over enough to make contact occasionally with the top and base. so i pulled it all apart and bored out the graphite bush ( again) this time iv made new one out of delrin, which im hoping will do the job. also made a new glass power cylinder and piston as i manage to break the glass on the first :doh: this new power piston is better then the first though so im hoping it will help. |
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