MFT Angles using Qwas Dogs

[andy5405]

A while back I watched a video about using the MFT and Qwas Dogs to do angles other than 45 and 90. I think it might have been Paul Marcel. Anyway I decided to look into it this morning and can't find any angles that I can see that are useful in general construction/woodworking.  Am I missing something or is my maths wrong. The excel formula I used is =ATAN(B7/C7)*180/PI()

Here is the table of results I got which I think covers all the possibilities with an MFT top.

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[Steve R]

Andy,

Which angle are you after?  With the Dogs there is a known 90 degree in every set up. But only the 45 degree triangle are both legs the same angle. Therefore you have to pick the corner. you want to find. Below is what I remember, to find angles for this situation.

[attachthumb=#]

This video might be helpful also

trig to solve angles in triangle

Cheers,
Steve

 

[andy5405]

I'm happy with the maths, I mentioned that just in case I had made a schoolboy error. I was wondering if any of the angles are any use in common cuts either in construction or woodwork.

 

[peter halle]

I am going to use my newly acquired Qwas Dogs and my mft to make templates for cutting siding, etc.  no math necessary.  The holes can be used to set up rise over run.  All you need are equal units.

Peter

 

[PaulMarcel]

In my video review of the MFT, I mentioned that the Qwas dogs could be used for rise-run like Peter said.  That said, dunno what the angles really are as whenever I've read Fine Homebuilding articles, they constantly quote angles in rise-run, which is easier than degrees and can be directly marked with a framing square.

 

[andy5405]

Thanks, that makes a lot more sense now. I was hoping to find angles like 22.5 or 37.5 degrees amongst all those permutations.

 

[Alan m]

you also have to remember that tose values are for the rail in the ''90degree position''. if you use rail dogs and put the rail at  a different angles ( move the end of the rail over a hol;e or two ) there are a lot more angle posabilities