1. I am sendingyouthisdocumenttosupportandillustrate whatIdidinFWT, LLC.
The specscalledfor1 1
/8” holesbutwe alwaysreceivedthe material witha1 1
/16”holes,andwe were
enlargingthe holeswithareamer – whichdoesnotproduce a true roundhole
Most of the time the
operatorwentoff the
roundshape,and had
to fill it with welding
material and work on
it again

2. Annularcutterscome witha ¼” pilotpinwhichservesasthe centerforthe annularcutter to cut a round
hole withoutwobbling.Drillinga¼”hole forthe pilotpinisthe wayto go.
But inour case we alreadyhada 1 1
/16” hole andthe ¼” pilotpinwasuselessforus.
I envisionedandfabricateda1 1
/16”pilotpinto keepthe annularcutterfromwobbling.

3. And it went from an average of 24 minutesperhole to 28 seconds,flat.
We’re making50 holesinthe time we were making1.