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I am researching the manufacturing technique of two turnwheels made by Adolf Bliechert in Leipsig Germany in 1883.
The wheels ar 6' 8" diameter with 8 off 1 1/4" dia spokes cast into the rim and the hub.
The hub is the interesting part, as it is in two halves each holdiing 4 spokes.
The two hub halves are separated by spacers approx 11/16" and the hubs and spacers are held together by two shrink rings, one on each side.
The hub is tightened onto the shaft with a single morse taper key, there is no slot in the shaft only the hub.
I make the following assumptions:
The hub is cast in two halves to prevent it breaking when cooling.
The pre-made spokes are cast into the hub and the rim.
The bore of the hub is machined after the spacers and shrink rings have been installed, to give a 1 or 2 thou clearance on the shaft to allow a light push fit.
I make the following observations;
The spokes appear not to have any protrusions, one connection is smashed and the spoke is cylinderical inside.
Questions:
How do I get photos into these posts?
Are the spacers driven into the gap between the hub halves to put the spokes in compression then the shrink rings fitted to hold it all together, or are the spacers a slide fit and the shrink rings pull it all together and put the spokes under tension?
The wheels ar 6' 8" diameter with 8 off 1 1/4" dia spokes cast into the rim and the hub.
The hub is the interesting part, as it is in two halves each holdiing 4 spokes.
The two hub halves are separated by spacers approx 11/16" and the hubs and spacers are held together by two shrink rings, one on each side.
The hub is tightened onto the shaft with a single morse taper key, there is no slot in the shaft only the hub.
I make the following assumptions:
The hub is cast in two halves to prevent it breaking when cooling.
The pre-made spokes are cast into the hub and the rim.
The bore of the hub is machined after the spacers and shrink rings have been installed, to give a 1 or 2 thou clearance on the shaft to allow a light push fit.
I make the following observations;
The spokes appear not to have any protrusions, one connection is smashed and the spoke is cylinderical inside.
Questions:
How do I get photos into these posts?
Are the spacers driven into the gap between the hub halves to put the spokes in compression then the shrink rings fitted to hold it all together, or are the spacers a slide fit and the shrink rings pull it all together and put the spokes under tension?
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