Return to the Woodworking Forum | Post a Follow-Up

 o
screw into polymer

Posted by mutual (My Page) on
Tue, Oct 21, 08 at 16:25

I'm thinking of using a cutting board made of polymer for a collapsible shelf. will polymer hold a screw? thanks


Follow-Up Postings:

 o
RE: screw into polymer

"Polymer" is a pretty broad term, but it the material is suitable for use as a cutting board then the answer is probably yes. I would be careful to drill full-depth pilot holes to avoid cracking the material with the screws.


 o
RE: screw into polymer

Can you give us more details? Is the screw going through the cutting board and then into something else? Or is the screw holding in the cutting board? If so, how thick is the cutting board?


 o
RE: screw into polymer

The screw will go thru a collapsible metal bracket and then into the polymer. the screw will be holding in the polymer. the polymer is 1/2 inch thick (i can buy a sheet 1 inch thick at much higher cost). so the screw will be 3/8 in the polymer. if you think it will hold what type of screw should i use? thanks


 o
RE: screw into polymer

Not sure how fancy you want to get in this installation. I wouldn't rely on ANY self tapping screw to hold this. This would be my choice: Drill and countersink a hole from the bottom, countersink just enough for the head of the screw to be flush. 10/32 or 12/32 screws would be plenty. Screws are available in chrome, brass, stainless and others. Use an acorn nut to secure it to the bracket. No threads showing and no sharp edges. Clean looking and strong. Countersink + hardware all for under $10


 o
RE: screw into polymer

Cloudcrasher That sounds like a good idea but don't you mean countersink from the top? The shelf will be on top of the bracket. thanks


 o
RE: screw into polymer

Another thing to consider is whether the 1/2" material is rigid enough to bridge between these brackets without flexing significantly while you're using it. If the screws are near the edges of the cutting board, and if the flexing of the board creates stress at those fastening points, you may have a failure rather soon.


 o
RE: screw into polymer

OK..I wasn't sure. At first it sounded like you were putting the poly underneath.So yes, you're correct. And if you think the amount of weight might make this sag in the middle, install a piece of 1/2" aluminum flat stock across the face and paint it to match or a contrasting color.


 o
RE: screw into polymer

The board will be 36"x14"x1/2" the brackets will be 16" apart. This collasible wall shelf is for the laundry room that's why I'm using polymer. I'll let you know how it turns out. wish me luck! thanks again. Bob


 o
RE: screw into polymer

Good luck! And if the screws don't actually bite, then you can go to "chicago bolts" (link below) or shoulder bolts (also findable in LV-land).

For what its worth, I've found lexan to be prone to cracking when trying to screw; HDPE is much more forgiving.

Here is a link that might be useful: Chicago Bolts


 o
RE: screw into polymer

 o
RE: screw into polymer

If it is the typical white translucent cutting board material it is high density polyethylene.

You need screws with very coarse threads since the material is very soft.

Through holes (even with a countersink) will be hard to keep clean.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Woodworking Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here