Bearing bush measurement
Thread Content
Why is it necessary to place a wire or temporary shim in the split surface of the bearing seat when measuring the radial clearance of the bearing bush? Can’t the measurement be carried out without it?
First of all, lead wire compression measurement is not the same as a gasket; they are two different concepts. Lead wire pressing takes advantage of the soft nature of lead metal; when pressing, a lead wire of appropriate diameter is used, and the remaining thickness after pressing essentially represents the actual gap. The thickness of the shimming is adjusted according to this gap. This is a makeshift explanation for reference only.
Eliminates reading errors in measuring the thickness of the lead wire
What he means is that the bearing shell clearance is already a positive value, so there is no need to insert shims between the surfaces of the shells
Using wire on the mid-surface can reduce the errors associated with the wire; in some measurements, materials such as copper sheet are used instead of wire on the mid-surface, but it seems that this does not address the errors caused by compression of the wire
From a decent perspective, it should be an issue with the amount of pressure applied by the gasket and the wire. Wire is a measuring tool, while shims are used to adjust the gap. I’m not sure if this way of phrasing is okay;P
Yes, it can be understood that way, but we still haven’t answered the original poster’s question
If understanding it through such a distinction helps, then I guess it will be clear. Self-perception; P
When the mid-surface might not make good contact, using the difference in thickness of two wires yields more accurate results
For the final tightening force of the bearing, it is necessary to use wire or shims on the middle seal; as for the clearance at the top of the shaft, isn’t it okay not to apply any tension there? Is it really necessary to do so?