Peter -
There is a drilling jig that one must use to keep the holes in the proper
alignment when machining for the inserts on these engines. What makes the
job more difficult is the alloy with the silicon. It makes for a good
wearing surface but it is really tough on drills and taps as well. Timeserts
are also available in stainless, I'm not sure what MB calls for in this
application. An even more superior insert is the Keensert. We use these a
great deal on the parts we design for spacecraft, but the downside is more
machining costs, more space around the hole for the flange, and of course
cost.
Barry
> What you describe {Threads not perpendicular to the milled
> surface} would be a night mare to repair, requiring a threaded insert.
>
> Our shop is a foundry and machine shop. We pour many aluminum
> castings and machine them.
> Many of the aerospace parts have the threads helicoiled.
> Some are helicoiled because the are serviced in the field. The
> Helicoil, having a stainless steel thread makes a superior joint
> in all ways.
> Many parts have repair procedures to salvage damaged threads.
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