MFT Sag?

[klg]

Hello,

I purchased a 1080 replacement top to use as a template for a DYI MFT.  I just did a few quick measurements with a straight edge and feeler gauges.  With a 600mm/24" straight edge across the table, there's ~ .6mm gap in the middle.  This was in one area.  If I flipped the top, the gap is one the outside as expected. 

What is an acceptable amount of sag?  What do you see?  Should this go back?

Thanks,

Ken

View attachment 1
View attachment 2

 

[bkharman]

Are you using it to route holes for a larger top?  If so.6mm won't make much of a difference, especially if you have it so the gap is in the middle between the template board and your workpiece.

If you bought it to use as an actual top and in your own workbench frame... That decision is a little more difficult. If it was me, and the dealer was close I would just swap it out. If you got it from Amazon or some other retailer, then that might be difficult.

Cheers. Bryan.

 

[ear3]

I've never actually checked mine, so I couldn't say, but I'm curious to find out what other's experiences and expectations are on this.  I could be wrong, but the number sounds minimal enough that it shouldn't really affect 90 degree cutting, especially since you are putting pressure on the right side when you pass the saw over it.  It could conceivably throw things off a bit, though, if your're doing bevel cuts across the diagonal of the table.  If the standard issue table is dead flat, then by all means, return it.

Hello,

I purchased a 1080 replacement top to use as a template for a DYI MFT.  I just did a few quick measurements with a straight edge and feeler gauges.  With a 600mm/24" straight edge across the table, there's ~ .6mm gap in the middle.  This was in one area.  If I flipped the top, the gap is one the outside as expected. 

What is an acceptable amount of sag?  What do you see?  Should this go back?

Thanks,

Ken

View attachment 1
View attachment 2

 

[Louis84]

That's level of differences doesn't bother me personally. But you have every right to get it swapped should you not be happy with it.

 

[Holmz]

It will sag on its own over time.
The wood you cut also bends to stress.

You could put some stiffeners on it when storing it like the old tennis rackets.

 

[Dangermouse]

your being to precious, it's a piece of MDF, that your going to cut into and drill holes in, as long as the holes are square who cares ;-)

 

[mouppe]

I wouldn't worry about it, but if it bothers you, put a piece of blue tape in the middle to offset the gap.