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Slowly casting up parts for a steam twin marine engine |
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Artie:
Hey all, got some shop time today and made a start on the eccentric straps. As already detailed Ive made the sheaves so they can be dismantled and this will allow me to use one piece straps and this is todays efforts.... I bolted the four pieces togather and driledl the pilot holes in one go and then seperated them and bored the eccentric sheave holes using the boring head. These have 0.1mm (4 thou) clearance and 0.2mm side play (8 thou). These are what they look like in Edgar T Westburys plans. |
Artie:
and these are what thye look like in my build.... bolted the drilled flat plate to the table and faced it off til it was 10.5mm. Then marked out the raised boss area and trimmed around it... Then proceeded to reduce the body of the plate down to 4mm.. |
Artie:
Fitted the bull nose cutter and radiused the edge of the boss. And then finished facing the plate at exactly 4mm. The bearing surface of the sheave is 4.2mm. |
Artie:
Theres one done, this will be fitted to a mandrel in the 4 jaw on the RT to radius the big end and also to trimk the unwanted material to shape the strap. Lot of trimming to be done yet.... And three more to do... and by the magic of photography...... And thats it, these are a nice sliding fit with not discernable slop. Pretty happy with them so far... Im back on the road tomorrow for a week, see what I can get done after I get back... Cheers all.. |
Artie:
and an idea of what the profile should look like when finished... No oil reservoir like in Edgars, just a drilling to the journal with a countersunk opening I can jam the oil can into and pump oil through it every so often. |
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