Free 173 Best Homemade Tools eBook:

1. Mechanical Sine functions depend on two rolls a known distance apart, 5" and 10" are common but any distance works. With gauge blocks stacked under the 'rear' pin, it elevates the plate a specific amount, by a simple calculation. If pivot and rear are parallel in two planes, accuracy is assured. Quality sine plates have two surfaces for gauge blocks, one being .1000 deeper. That accommodates block sets with .1000 minimum thickness, using .1001 will create the incline.

https://en.wikipedia.org/wiki/Sine_bar

2. Duh, you are using the hinge pin as the first roll. Thanks, that is what I was not seeing.

Ralph

3. Everybody (many is more accurate) complicate tools with a sine function. Distance between rolls is immaterial knowing their spacing is what makes it work dependably. Do a couple calculations at say 3.500, 5.000, or 10.000". Then insert a actual inspected length, say you determine the planned 5.000" turns out 5.006. Depending on work you do that amount will result in a small percentage, and why longer bars are more accurate. I think right here on HMT.net, Marv did one in wood or cardboard that still worked. With one or two nice plates of material you can go to town. And ignore a machining process using two vee's; takes a degree of additional sophisticated tooling. [swivelhead mill, relieving cutter, angle wheel dresser, surface grinder, and some way to generate accurate spacing, and you'll still be compelled to determine the result]

4. Originally Posted by Toolmaker51
Everybody (many is more accurate) complicate tools with a sine function. Distance between rolls is immaterial knowing their spacing is what makes it work dependably. Do a couple calculations at say 3.500, 5.000, or 10.000". Then insert a actual inspected length, say you determine the planned 5.000" turns out 5.006. Depending on work you do that amount will result in a small percentage, and why longer bars are more accurate. I think right here on HMT.net, Marv did one in wood or cardboard that still worked. With one or two nice plates of material you can go to town. And ignore a machining process using two vee's; takes a degree of additional sophisticated tooling. [swivelhead mill, relieving cutter, angle wheel dresser, surface grinder, and some way to generate accurate spacing, and you'll still be compelled to determine the result]
These are some of my posts relevant to sine bars and angle measurement...

Blue collar sinebar

Sine bar errors

Accurate angle measurement

5. Oh Marv, you teach +(entertain) us more than we can ever Thank. The blue collar sine bar is just one example. What on earth could be a less intimidating project name? I know not just who posted the uncommon material version, habitually made it yours...
The links will satisfy ralphxyz 100%, Thanks Again.

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