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Thread: measuring the male dovetail
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28th February 2014, 07:27 PM #1GOLD MEMBER
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measuring the male dovetail
I have a problem with the formulae shown here
https://www.google.com.au/search?q=m...ml%3B324%3B268
T=S-D * (2.732)
If S is 2"
D is .25"
and the other crap is 2.732 for a 60 degree cutter
how can T be bigger than S
what am I missing here...besides my marbles
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28th February 2014 07:27 PM # ADSGoogle Adsense Advertisement
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28th February 2014, 08:00 PM #2
Hi Richard,
i'm not even going to try to work it out, try this program, it does all the hard work for you.
http://home.scarlet.be/mini-draaien-...rogram-01.html
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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28th February 2014, 08:08 PM #3
I think it should be T=S-(D*2.732), giving you 1.317"
The shop calc says.......1.317".....
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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28th February 2014, 08:11 PM #4Senior Member
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For the "Other crap", I got (A stupid answer because I have fat fingers)
I did it as 1+(1/tan(30))
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28th February 2014, 08:20 PM #51915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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28th February 2014, 08:25 PM #6
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28th February 2014, 08:36 PM #7Senior Member
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1st March 2014, 09:23 AM #8GOLD MEMBER
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Thanks fly
seems I was missing something...an education in maths and parenthisis..is that the word?
I like you formulae better Ueee...i knew that the bit in brakets must first be worked out on the order of the other stuff (didnt know might be better answer, but I am sure I was told at some stage but probablymust have been talking at that moment)
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1st March 2014, 10:02 AM #91915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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1st March 2014, 10:36 AM #10
BODMAS is how you remember it. However a common misconseption is to consider every item in this exact order. I am not sure how much difference it makes but a better way to represent it would be BO(DM)(AS) where the functions in brackets should be performed in the order they occur in the formula. ie It does not matter whether you divide or multiply first. You get the same result. 6*3/2=9 3/2*6=9 Ditto with add/subtract.
Brackets (parenthesis)
Order
Division
Multiplication
Addition
Subtraction
Cheers
Dean
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4th March 2014, 07:43 AM #11GOLD MEMBER
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