"Thing I should have done" alert: Anyone paying way too much attention to what's in the pictures (as opposed to thinking 'ooh, pretty' and drooling a little as I'd intended) may have noticed the clamp arm above isn't machined flat.
In general I trust my designs and measurements; if it works on paper, it works for real. The only time it doesn't is when there's a mistake and it's more efficient to catch mistakes before making them then after.
Thus I'm irked to realize that the radius cuts in the underside of the discs are all identically tilted by a few thousandths; one side is slightly deeper than the other. The slight tilt is a small mistake that won't matter much in the final assembly, and due to some wiggle room provided by the podwercoat over a later part that hasn't appeared in the UGP project log yet, probably won't even end up being visible under close inspection. But it's still best not to be lax about tolerances; insignificant errors can easily stack up into ugly assembly problems.
The oversight above was to assume the aluminum plate out of which I made the jig arm was [on average] flat. This was a stupid assumption; I soon as I thought to question it I realized it was almost certainly not true. The surface of the jig where the discs clamp down should have been machined.
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Date: 2007-09-04 07:06 pm (UTC)In general I trust my designs and measurements; if it works on paper, it works for real. The only time it doesn't is when there's a mistake and it's more efficient to catch mistakes before making them then after.
Thus I'm irked to realize that the radius cuts in the underside of the discs are all identically tilted by a few thousandths; one side is slightly deeper than the other. The slight tilt is a small mistake that won't matter much in the final assembly, and due to some wiggle room provided by the podwercoat over a later part that hasn't appeared in the UGP project log yet, probably won't even end up being visible under close inspection. But it's still best not to be lax about tolerances; insignificant errors can easily stack up into ugly assembly problems.
The oversight above was to assume the aluminum plate out of which I made the jig arm was [on average] flat. This was a stupid assumption; I soon as I thought to question it I realized it was almost certainly not true. The surface of the jig where the discs clamp down should have been machined.