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Measuring Dovetail Slots, My New Toy (Read 2264 times)

n.r.davis Oldtimer Offline Posts: 586 Joined: Dec 3^rd, 2015	Measuring Dovetail Slots, My New Toy Feb 22^nd, 2018 at 2:53pm	Print Post
	Always wanted one of these, Starrett Taper Gage and found a use for it. Blades are .012 thick, each line is .001 and so I need to come up with a constant to add to get the Corner to Corner measurement. Boys and Their Toys!....


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sureshot Senior Forum Member Offline Posts: 321 Location: Snohomish Joined: May 27^th, 2007	Re: Measuring Dovetail Slots, My New Toy Reply #1 - Feb 22^nd, 2018 at 3:02pm	Print Post
	Would it work to simply bevel the edges to a standard dovetail angle to fit the corners? I'm no machinist so just asking. Steve


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n.r.davis Oldtimer Offline Posts: 586 Joined: Dec 3^rd, 2015	Re: Measuring Dovetail Slots, My New Toy Reply #2 - Feb 22^nd, 2018 at 3:14pm	Print Post
	Thought about that but it is getting too small for my world. Kind of a hammer guy. I am thinking a Right Triangle solution would be easier for it. I just don't like Math! David


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sureshot Senior Forum Member Offline Posts: 321 Location: Snohomish Joined: May 27^th, 2007	Re: Measuring Dovetail Slots, My New Toy Reply #3 - Feb 22^nd, 2018 at 4:05pm	Print Post
	I don't know what the typical dovetail angle is but you could find a constant using the formula; constant=0.012/tangent of angle X 2 For example if the angle is 60' it would be .012/(square root of 3) x 2 =0.0138 I think so anyway Steve


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16711 Location: Oregon Joined: Feb 2^nd, 2009	Re: Measuring Dovetail Slots, My New Toy Reply #4 - Feb 23^rd, 2018 at 10:58am	Print Post
	For years I've simply used a piece of shim stock I cut to be tapered from 5/16" on one end to 1/2" on the other. I slip it in and use a pencil to mark it. Then use my micrometer to read at the pencil mark. Always worked great for me. A piece of soda pop can works well as shim stock to make these also. You can cut it with scissors.

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frnkeore Frequent Elocutionist Offline Posts: 7390 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Measuring Dovetail Slots, My New Toy Reply #5 - Feb 23^rd, 2018 at 1:31pm	Print Post
	One thing you have to consider, regarding dovetails, is that the corner is a nominal dimension. They're suppose to be measured between pins. The corner of a DT envelope's a radius as the cutter wears so, I really like that taper gauge and may have to get one, myself. Using it and doing the math for the corner, should make cutting larger DT's a breeze. Frank

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texasmac Frequent Elocutionist Offline Posts: 1981 Location: Central Texas Joined: Aug 16^th, 2004	Re: Measuring Dovetail Slots, My New Toy Reply #6 - Feb 25^th, 2018 at 7:49pm	Print Post
	I usually use Marlinguy's technique, which is fast & accurate enough for my needs. For other methods, click on the link below to see my article titled, Measuring Dovetail Slot Dimensions. (You need to *Login* or *Register* to view media files and links) Wayne


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