Help needed : Attaching a vise to mdf mobile assembly table

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Forum topic by Ezra posted 10-09-2009 08:55 PM 2691 views 0 times favorited 3 replies Add to Favorites Watch
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52 posts in 4701 days

10-09-2009 08:55 PM

Topic tags/keywords: assembly table

I am in the process of designing a mobile assembly table that will be doubling as my saw outfield table. Since I am planning on using the top for an assembly table, I wanted a relatively flat surface. For that reason I was going to glue two 4 by 4 sheets of 3/4 mdf and top it off with a 4 by 4 sheet of 1/4 hardboard. My question is regarding attaching my 7 inch front mount vise. I would like to mount this vise on a corner of the bench, but had concerns regarding the strength of the mdf to hold the vise. Specifically will the screws for the vise hold in the mdf, and do I have to worry about sagging? My other option would be plywood, but it is a bit more expensive, and probably not as flat. Any advice.

-- Ezra in Brew City

3 replies so far

View davidpettinger's profile


661 posts in 4213 days

#1 posted 10-10-2009 03:10 AM

The answer is probably not(will the screws doe the vise hold in MDF). Since I don’t know the dimensions of the front mount style of the vise, my only suggestion would be to remove an area of the MDF top piece and dutch in some 3/4” hardwood only to cover the span of the area for the screws. You could always use a block of 2×4 S4S oak in that corner and glue and screw to the table sub frame.

-- Methods are many,Principles are few.Methods change often,Principles never do.

View ajosephg's profile


1895 posts in 4574 days

#2 posted 10-10-2009 04:57 AM

I think that thru bolts would be better than screws. I have an assembly/outfeed table with a solid core door as the top, which is essentially particle board on the inside. I counter bored holes in the top so that the heads of the bolts would sit slightly below the surface of the table top. I used flat washers under the bolt heads so they wouldn’t dig into the “wood.” Without going downstairs to double check, I used the largest bolt that the vise would accept which was either 3/8 or 5/16.

After about 6 months the table is still flat.

-- Joe

View Ezra's profile


52 posts in 4701 days

#3 posted 10-11-2009 11:41 PM

Thank you both for your response. I spent the entire day Saturday working on this thing, and hope to post some pictures shortly. I haven’t attached the vise yet, as I ran out of time working on it yesterday. I plan to take your advice Joe as I have a 1/4 inch skin of hard board going over the laminated plywood top that will cover up the countersunk bolts. Thanks for the suggestion.

-- Ezra in Brew City

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