Quantcast
  • We invite you to join UKWorkshop.
    Members can turn off viewing Ads!

MDF compression strength - formula/calcs???

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Digizz

Established Member
Joined
22 Jan 2004
Messages
384
Reaction score
0
Location
Oxfordshire
Is there a source of info on the compression strength of MDF (turned on it's side) - any rule of thum or more scientific calcs?

I'd like to see if the aquarium stand I'm proposing (separate thread) is going to be strong enough.

I guess I'll also call the manufacturers too.

Thanks,

Paul.
 

johnelliott

Established Member
Joined
16 Apr 2003
Messages
1,105
Reaction score
0
Location
Near Swindon, Wiltshire
Not sure if I see what you are getting at there, Paul. I find it difficult to believe that you are asking if a piece of MDF is going to be squashed by being sandwiched between the weight of the aquarium and something rigid?
Are you going to use the mdf vertically? Perhaps you are asking if it would buckle?

John
 

Digizz

Established Member
Joined
22 Jan 2004
Messages
384
Reaction score
0
Location
Oxfordshire
I want to find out if my cabinet design will withstand the weight of the tank, rock and water. It's something like a tonne in weight (still doing the calcs). The stand is a 'box', so the MDF is stood vertically like you say. I want to find out what kind of pressured the MDF will take before failing.

My other post is here:

https://www.ukworkshop.co.uk/forums/viewtopic.php?t=3885

Pictures some way down the post.

Thanks,

Paul.
 
A

Anonymous

Guest
Digizz

Don't know how you are calculating the weight of the tank but a litre of water weighs exactly 1Kg - don't know if this will help
 

Losos

Established Member
Joined
24 Aug 2004
Messages
1,469
Reaction score
0
Location
West Suffolk
Paul, Sorry I can't help with the MDF question but am impressed with your shop. I'm in the process of building mine (Can't pour concrete right now due to sub zero temperatures :cry: ) How much weight will your floor support? I'm also considering Sheppach but have a very heavy cast iron bandsaw to fit in.
 

Digizz

Established Member
Joined
22 Jan 2004
Messages
384
Reaction score
0
Location
Oxfordshire
Losos":321p24p8 said:
Paul, Sorry I can't help with the MDF question but am impressed with your shop. I'm in the process of building mine (Can't pour concrete right now due to sub zero temperatures :cry: ) How much weight will your floor support? I'm also considering Sheppach but have a very heavy cast iron bandsaw to fit in.
TBH I don't know what weight the floor will support but as it's built on 200-300 mm of hardcore/scalpings and at least 100mm of concrete, it should (hopefully!!!) support a fair bit. The floor to the cabin is spread across the concrete using double the number of joists that are normally used in a log cabin - fairly robust :)

The Scheppach P/T is the heavy one - especially as it has a small footprint. If I was doing it again, I'd use a hardwood floor - softwood T+G marks really easily. The plastic wheels on the bases dig in and mark the floor a fair bit.
 

Digizz

Established Member
Joined
22 Jan 2004
Messages
384
Reaction score
0
Location
Oxfordshire
Tony":2wqfg947 said:
Digizz

Don't know how you are calculating the weight of the tank but a litre of water weighs exactly 1Kg - don't know if this will help
Thanks - that's helpfull - was just looking for that!
 

colinc

Established Member
Joined
30 Nov 2003
Messages
629
Reaction score
2
Location
South Derbyshire, UK
The compressive strength of the material is relevant to the ability of an edge to transfer the load bearing on it, but does not help you design the box carrying the aquarium. As someone said earlier the box will buckle, and well before you crush the material.

You are interested in the material's modulus of elasticity (E) to do the analysis. Mdf is not a lot better than balsa wood in this respect as it's ok in compression but poor in tension. See here for some interesting data:
http://www.geoffswoodwork.co.uk/book%20weights.htm

Isn't there something available commercially that would give you a reliable starting point? I can't help but think that I'd go for a steel frame clad in veneered mdf (but then I have a MIG welder). There are some knock together systems for box-sections that might help here.
 

jasonB

Established Member
Joined
26 Nov 2004
Messages
5,044
Reaction score
0
Location
Surrey
From my Medite details the modulus of elasticity for 18mm standard MDF is 3800N/mm2 if you can calculate it from this then good luck.

Also Medite do NOT recommend joining MDF with mitre joints where moisture is likely( such as when using exterior grade outside) , back to the drawing board.

Jason
 
Top