Author Topic: Parf Guide mark 2 issues and questions  (Read 96316 times)

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Offline tsmi243

  • Posts: 319
Re: Parf Guide mark 2 issues and questions
« Reply #300 on: November 01, 2021, 12:57 PM »
For what it's worth-

I bought a PGS, Mk2 about a month ago, and haven't put it to use yet.  But this video had me wondering- so I mocked it up on my MFT, and took a reading.

It's real.  It's about 0.010" of play.  You can tell just by feeling with your hand that the play is coming from the pin ends, not the drill guide.  The pins ARE dead tight in the MDF, and the drill guide joint has no tangible play, but the joint from the pin to the parf stick DOES. 





It really does FEEL like quite a bit of slop, but how much actual error is this?  Well, it's 0.010" at the end of a 39" run, so if my trig isn't too rusty, I'm getting 0.014 degree angle change (somebody please check this, I flunked out of college over a decade ago  [big grin]).   But that's the included angle- any actual error will be half this amount one way or the other.  So you're looking at 99.992% accuracy for your square cuts, if that's only if you do the WORST possible job when drilling your dog holes.  As Peter says, keeping the parf sticks in the center of the range will minimize this even further, and isn't hard to do by eye. 




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Offline tsmi243

  • Posts: 319
Re: Parf Guide mark 2 issues and questions
« Reply #301 on: November 01, 2021, 01:01 PM »
Followup to the above post---

I replaced the pins with tapered drywall screws to hold the far ends down, removing ALL play at that end.  The drill guide is now the weakest link, and the wiggle room dropped to 0.004".  Which I think is fantastic. 

Just by feel, the difference between 0.010" and 0.004" is pretty huge.  If it had been 0.004" right out of the box, I don't think I would have noticed it.  The ten-thou sticks out like a sore thumb.