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Thread: Straight Edge

  1. 16th August 2018, 06:06 PM #1
    pach
    pach is offline SENIOR MEMBER
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    Default Straight Edge

    Hi Guys,

    I have recently purchased a second hand jointer and want to set it up properly (as best I can).
    Total length of the infeed and outfeed is about 1500mm.
    I have been looking at buying a decent straight edge but noticed they come at 36" (~965mm) long.

    Is that enough or should I use a longer straight edge ?
    What straight edge do you use ?
    Is a new long level going to do the job or are they too inaccurate (if I use filler guages).

    Thanks!
    Nick
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  3. 16th August 2018, 07:00 PM #2
    lewisc
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    I was setting up a jointer and wasn't convinced the 1m ones would do. I picked a 1.5m one from here: Straight Edges - Products - Precision Specialty Tooling

    It was pricey (about $250ish) but it's been super useful for so much more. I posted the same thing when looking and a few suggested aluminium extrusion would also work.
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  4. 16th August 2018, 07:05 PM #3
    elanjacobs
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    Thick walled box section aluminium will do the job just fine, that's what the tech used to set up the one at work
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  5. 17th August 2018, 12:46 PM #4
    rustynail
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    I use a piece of aluminium sliding door extrusion, tested true for straight. Three bits of thin paper under the straight edge on the tables and if all tight, she's flat.
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  6. 17th August 2018, 04:44 PM #5
    double.d
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    I have varying lengths of 75 x 25 x 2 RHS aluminium that always stay straight.
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  7. 18th August 2018, 04:11 PM #6
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    markharrison
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    Default

    TL;DR The shorter straight is probably all you need.

    If the two tables are found to be flat according to the shorter straight edge; then according to the laws of geometry, the use of the shorter straight edge will prove when the two tables are coplanar.
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