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Laminating MDF

How to glue up multiple sheets of MDF into a single thick sheet for complex CNC profiling. February 10,

Question

This may seem like a trivial question. We produce intricate computer models in wood and solid surfaces as product designers. Yet, some basic woodworking techniques elude us. We are working on CNC milling a table insert in laminated MDF, 1.5 inches thick, with each MDF sheet being .75 inches thick.

Our current method involves spreading ample wood glue on one sheet, placing another on top, and stacking four more sheets above for pressure. However, this approach is failing to bond the pieces adequately, with the sheets sometimes delaminating during milling. Does anyone have tips on laminating two MDF sheets? It seems straightforward, but it's proving problematic.

You will receive efficient and thoughtful service from eooe.

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Forum Responses

(Adhesive Forum)

From contributor E:

When you say "spread on lots of glue," you might be using too much. For tasks like yours, I use a fine-grooved glue trowel to ensure even coverage. Also, allow the glue to dry overnight, as the center may take longer to dry. Check with suppliers; someone likely has 1.5" MDF sheets. Remember to scuff sand (80 grit) and remove dust before gluing.

From Gene Wengert, forum technical advisor:

Sanding MDF and veneer just before gluing is crucial to achieve fresh surfaces, devoid of contaminants like oils or waxes from initial production.

From the original questioner:

Thank you for your suggestions. We appreciate your help with what might seem like a simple issue. Point taken on 1.5" MDF and sanding.

From contributor R:

I've also laminated MDF without issues. First, scuff sand both sides to be glued, apply a thin glue layer on both, press them together, and let it set overnight for the best results.

From contributor H:

Stacking four sheets on top offers minimal pressure! Proper pressing needs around 45 lbs per sq. foot. Consider purchasing 1.5" thick MDF instead.

From contributor M:

I laminate MDF for machine fixtures using contact cement, just like laminating Formica. Follow can directions, especially letting both pieces dry to the touch before joining.

From the original questioner:

The glue held! We'll implement your common-sense suggestions next time—80 grit, 1.5 MDF, etc.

From contributor D:

For future needs, consider a vacuum bag for better results than stacking sheets.

From the original questioner:

To answer some inquiries, we use a 3-axis CNC mill, not a 5-axis one. The piece's bottom is flat without undercuts!

From contributor D:

My vacuum bag reference was for laminating two sheets for a thicker workpiece.

From the original questioner:

Using a vacuum bag for clamping during lamination? Interesting concept! We also found Perfect Plank lumber for great thickness. Thanks for the tip!

From contributor G:

We scuff, wet, and use gorilla glue when laminating MDF, then screw them together and let it set overnight. Screw holes are manageable with wood filler or Bondo since MDF is paint-grade.

From contributor T:

Gorilla Glue can smoke and stick to the cutter during CNC if not fully dried.

From contributor H:

I specialize in laminating panels. If this is an ongoing project, consider investing in a small cold press. I recommend Ultimate Titebond III for glue with a 6 to 10 wet mil coverage, applied with a roller. The glue needs +/- 125 PSI or 48,000 lbs distributed equally for 30 to 60 minutes, requiring a press.

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