Results 1 to 3 of 3

Thread: Hold down for planing slabs

  1. #1
    Join Date
    Apr 2015
    Location
    Lacrosse WI
    Posts
    44

    Default Hold down for planing slabs

    I am trying to make a hold down for planing slabs. I bought some unistrut to act as a t track. Planning on bolting that down on the bed and using wedges to keep the slab tight. Also thought of maybe flipping the strut over and using a horizontal clamp.
    1614306646234108876844.jpg
    16143067210761327955906.jpg
    16143069091982051772344.jpg

  2. #2
    Join Date
    Mar 2004
    Location
    Lenox High School, Lenox MA
    Posts
    916

    Default

    I have used screws from the underside of the table, along with wedges strategically placed to keep the slabs as parallel as possible.

    Phil

  3. #3
    Join Date
    Mar 2013
    Location
    Memphis TN
    Posts
    877

    Default

    I've planed plenty of slabs on my SB and I've found that very little hold down support is required. As long as you don't try and take off 1/4" at a time, all you need do is keep the slab from sliding. What I do is load the slab with the bow up, then shim the rock out of the slab on both sides with business cards (a good use of those old fashioned things). I typically use some boards to lock it into place but generally, the bigger the slab, the less hold down required. Once I flip it over to the flat side, the slab needs almost nothing to hold it in place.
    ShopBot Details:
    PRS Alpha 96x60x12
    4hp Spindle
    12" indexer
    Aspire
    Rhino

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •