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Caster mounting, into ply edge or no?

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Forum topic by CrankAddict posted 05-10-2021 05:17 PM 247 views 0 times favorited 5 replies Add to Favorites Watch
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CrankAddict

139 posts in 922 days


05-10-2021 05:17 PM

I’ve built a mobile shelving unit out of 3/4 baltic birch. It is domino’d and glued so the box itself is rock solid. The bottom sheet is 32” wide and 16” deep. Because it’s not super deep I’d like to spread the casters outboard as much as possible for stability. But that would mean 2 of the 4 screws would be going into the edge of the ply back sheet, not the face of the bottom sheet. Would this concern you guys at all? Obviously just sitting there it will be fine, but it’s going to be loaded up and heavy and if I’m rolling it and it catches on cracks in the floor I sure don’t want to have a caster or two rip off :)


5 replies so far

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Loren

11209 posts in 4768 days


#1 posted 05-10-2021 05:31 PM

Do a test on some scrap to see if it will split on you. Normally you wouldn’t want to put a screw into a ply edge without about 2” to the edge in case the ply separates.

Another thing you could do is cut a square of ply and mount that to the face of the ply, then mount your caster out on the corner.

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Novamr99

62 posts in 254 days


#2 posted 05-10-2021 05:36 PM

I would not mount casters into the edge of the plywood. Keep them inboard of that, like your pic shows. And if you are worried about the weight (you brought it up), mount another 3/4” BB support block between the caster and the bottom and bolt securely.

-- That's not an optical illusion, it just looks like one.

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CrankAddict

139 posts in 922 days


#3 posted 05-10-2021 06:27 PM


Do a test on some scrap to see if it will split on you. Normally you wouldn t want to put a screw into a ply edge without about 2” to the edge in case the ply separates.

Another thing you could do is cut a square of ply and mount that to the face of the ply, then mount your caster out on the corner.

- Loren

I definitely won’t be able to give them 2” to the border, but I’ll avoid going into the edge of the back piece. I may also use your idea of a second layer block, will just have to see how stable it feels. Thanks for the input!

View CommonJoe's profile

CommonJoe

17 posts in 43 days


#4 posted 05-10-2021 06:36 PM

”but it’s going to be loaded up and heavy”

If you can get away with the added height, then definitely add the piece of plywood for a second layer. Make sure that the plywood piece covers the edge of the side.
That way the plywood will help support the weight of the side instead of all the weight being on the bottom shelf.
I think you could mount your casters to the edge, use a #12×1” screw on the outside edge and nut and bolt in the other 2 holes.

View sansoo22's profile

sansoo22

1677 posts in 775 days


#5 posted 05-10-2021 07:09 PM

I’ve taken casters to the edge or very close to it but my sides rested on the bottom of my cabinet vs the bottom being between them.

If your definition of heavy is the same as mine I would probably end up building an “H” for the bottom of the cabinet. Now both sides are fully supported and i have an additional “runner” across the bottom just in case i feel like storing an anvil inside the cabinet. I’ve also got more meat for longer screws on the casters. That being said I have been accused of over engineering things a few times.

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