Some help with terms

[milkman]

Just seen the words 'hopus' and 'deeping' in another thread. Can anyone tell me what they refer to?

Thanks

 

[Argus]

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Hoppus Measurement is an obsolete imperial method of estimating the yield of a solid log’s timber volume by calculation based on the mean girth.
OK for straight cylindrical logs, but it's unreliable when used with logs of a non-uniform diameter.
Here’s a link that I found with the formula.


http://www.genesisny.net/Commodity/Timb ... rspec.html .

You could transpose it to SI units if you wish


Never heard of ‘deeping’.




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[AndyT]

I think 'deeping' means taking a deep cut through the thickness of a board to make two thinner boards - ie sawn when standing on edge.

Andy

 

[milkman]

cool thanks very much. That makes sense. It was on 40% Wastage but couldn't work it out from the context

 

[MooreToolsPlease]

Typically deeping would be done when the board you are trying to rip down the middle is bigger than your blade, so you have to cut from both sides.

 

[woodbloke]

Typically deeping would be done when the board you are trying to rip down the middle is bigger than your blade, so you have to cut from both sides.

...which is a dangerous practise as the guard and riving knife have to be removed on a table saw. Worth noting that it's been illegal to do this in commercial 'shops for many years - Rob

 

[markymark12]

Typically deeping would be done when the board you are trying to rip down the middle is bigger than your blade, so you have to cut from both sides.

...which is a dangerous practise as the guard and riving knife have to be removed on a table saw. Worth noting that it's been illegal to do this in commercial 'shops for many years - Rob

Deeping is the term used to describe the cutting of timber to the required thickness, yes technically on a hand fed circular saw, but go into most mills and ask for someone to deep something down for you and they will head for the resaw not the circular, or at least not anymore, there was a time when huge ripsaws ruled but those days have now thankfully passed and it is now more safely carried out on stenners etc.
The term does not have anything to do with burying the blade, which of course is illegal. ( exempt with the provision of special guarding so as no part of the blade is accessible from above when grooving)

The hopus measure is in common use everyday when dealing with round wood purchases, take a look at any parcel of timber from the forestry commission or estate and you will see measures such, as under bark, hopus content, etc. and is the reason for giving Q.G (Quarter Girths) in lot of sales.

Stick with the old measures, they served us well long before metric came along. Rant over.