Quote:
Originally Posted by Mr. Lim
Depending on the wood you use, it could maybe even cause it to swell?.
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We've definitely had this issue. Especially with very long pieces (eg long tubing), if the piece is being clamped with MDF underneath, swelling from absorbed coolent can cause some misalignment in the part. Plywood is even worse; because it isn't informally packed like MDF, it doesn't swell evenly and is very often not flat to begin with.
I can't remember any specific issues with sacrificial backing swelling, but I'm pretty sure we've had issues with it in the past. Don't read this the wrong way, coolant (especially mist coolant) is awesome, just swelling in the MDF backing can sometimes mess up milled parts.
Also, that film of MDF dust and coolant mixed together that forms after a long day of milling is really gross...