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-   -   Countersinking enlarges hole (http://www.mechmate.com/forums/showthread.php?t=1176)

usapaul Mon 01 December 2008 12:21

Countersinking enlarges hole
 
When I countersink the holes in the y-car carrier plate (10 30 450) it enlarges the hole before I can get the screw flush. I have only completed 1 hole like this on the motor side. It looks to be the hole that would be used for a lite spring setting. I am using an 82 degree cutter as that was all that was available and it looked close. Is this going to cause a problem? Is it necessary to cut all the way until the screw is flush?

smreish Mon 01 December 2008 12:52

Paul,
I found that I split the difference. My machine screws are not completely flush, but sunk enough to stay clear of the rails. Does that help?
Sean

usapaul Mon 01 December 2008 13:19

I think I will countersink to a point where it is not yet enlarging the hole and then go deeper if necessary once I get the rails and wheels fit. It doesn't seem like an enlarged hole will cause a problem.

gmessler Mon 01 December 2008 13:39

Paul,

You shouldn't have to countersink the hole for the spring tensioner. Only the second motor hole opposite the pivot.

Gerald D Mon 01 December 2008 19:55

The depth of the countersink is not critical. Suggest you drill until just before it enlarges the pilot hole. The screw head will be proud, but should not touch the rail. If it does foul the rail, then grind the screw head down a bit.

Gerald D Mon 01 December 2008 19:56

Remember that this countersinking is for the Gantry ends as well as for the Y-car.


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