Author Topic: Testing straightness of guide rail  (Read 557 times)

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Offline Chris Cianci

  • Posts: 96
Testing straightness of guide rail
« on: June 29, 2020, 05:43 PM »
Where do you test straightness of a guide rail? Along the rib the saw rides on.? On the non saw side along the rib that’s furthest away from the saw blade?

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Offline TwelvebyTwenty

  • Posts: 58
Re: Testing straightness of guide rail
« Reply #1 on: June 29, 2020, 06:20 PM »
Test what you cut rather than the rail.

Offline ear3

  • Posts: 4051
Re: Testing straightness of guide rail
« Reply #2 on: June 30, 2020, 09:23 AM »
Do test cuts on two pieces of plywood and see if there are any gaps when you line up the cut sides.
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Online tallgrass

  • Posts: 921
Re: Testing straightness of guide rail
« Reply #3 on: June 30, 2020, 04:16 PM »
How do you plan on testing? Also what length of rail?

Offline Birdhunter

  • Posts: 3056
  • Woodworker, Sportsman, Retired
Re: Testing straightness of guide rail
« Reply #4 on: July 01, 2020, 05:15 PM »
If I had any doubts about my rails, I'd test them against the bed on my jointer.

Offline Oldwood

  • Posts: 416
  • Alberta, Canada
Re: Testing straightness of guide rail
« Reply #5 on: July 01, 2020, 06:11 PM »
I do a quick check in the store by setting the rail on the box it is shipped in and centering the back about in the middle of the box. I carefully score a mark on the box using the rail as a guide then flip the rail end for end and lay it against the line. Viewing the line against the edge to see if it is aligned.

This is just a quick check and as has been said the truth is told by cutting 2 long pieces and hold the edges together but you must make sure the panels you cut are not releasing tension. I find most sheet stock will bow when cut down the middle of the sheet so best to first cut the sheet in half then trim a 1/8" off both edges.
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