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geoff walker 1	31/10/2018 13:20:57
521 forum posts 217 photos	Hi All, Has anyone any experience of using these. I thought about using them as main bearing inserts to carry the crankshaft on my new engine. Crankshaft would be 8mm dia mild steel or possibly silver steel. Engine will need to run at low and high speed Geoff Edited By JasonB on 31/10/2018 13:26:02
Jeff Dayman	31/10/2018 13:41:41
2356 forum posts 47 photos	Two things to check before using these in an engine - 1. max temperature of operation 2. PV factor with the kinds of pressure caused by piston forces , and the velocity range, in an IC engine or high speed steam engine (you don't mention what type of engine you will be making). I think you will find that all metal bearings of some sort will be needed, rather than PTFE lined shells.
ega	31/10/2018 14:09:00
2805 forum posts 219 photos	Some may remember Derek Beck's First Affaire with a Lathe series in ME in which he described building a milling spindle using (from memory) "Glacier DU" bearings. As I recall, when he was running in the bearings tiny fragments of PTFE were released.
Neil Wyatt	31/10/2018 19:29:27
19226 forum posts 749 photos 86 articles	See the 'technical tab': d = 8mm D =10mm b =10mm Structure =Steel support strip S.A.E 1010. Sintered bronze layer. PTFE and lead combination Maximum static load = 250 N/mm² Maximum dynamic load = 140 N/mm² Maximum sliding speed = 2.5m/s dry 5.0m/s with oil Operating temperature = -200° C to +280° C Thermal conductivity = 46 W/mk Coefficient of friction (dry) = 0.02 to 0.20 Coefficient of friction (oil lubricated) = 0.02 to 0.15 Recommended housing tolerance = 4.5mm/5.5mm H6 7.0mm/305mm H7 Recommended shaft tolerance = 3.0mm/4.0mm h6 5.0mm/75mm f7 80mm/300mm h8 Recommended shaft finish = Ra ≤ 0.4um (N5) Recommended shaft hardness = HB > 200

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