Calculating and setting up a taper part #1

Making a balancing mandrel for grinding arbors.

[jimmilne]

Super informative and well presented. I just finished machining and installing my taper attachment for my Harrison lathe and needed this "tutorial" to get my first set up set up. Thanks, thanks, thanks.

[josephmagedanz]

Stan, you make it look so easy. That's the definition of a virtuoso.
Thanks for sharing.
Joe

[steveallen]

Thanks Stan Hope you never get tired of doing these video classrooms

[dougbourdo]

got to love mathematics. Works every time. Nice tutorial.

[joell]

Stan, I really appreciate you sharing a real life, detailed example of how to perform such precise work. You are a fantastic teacher. Thank you.... Joel

[lazaglider]

I watch these things in awe of the precision you guys work to.

[kurthawkinson]

Hey Stan,
Thanks for the Bash, I had a good time. I enjoyed meeting you and all the you tubers. I just looked in my gift bag and noticed a drill bit from Drill Hog. I placed an order and just received the drill index and spiral stepped drill set. They look like quality items and hopefully will preform better than the HF stuff that I currently own. I wanted you to know that their support of your event is appreciated and did generate sales.
P.S. The food was great.

[pauljones]

Excellent explanation and taking us through the setup. Very instructive and useful. Thanks

[Toolmiser]

I think those are the arbors I just gave to Tom (tool trade)! Lol! Right on!! Great subject matter. Like you indicating set too!!👍

[billdlv]

Nice job on the angle measurement Stan.

[skinny]

Thank you, Stan, that was an awesome lesson, it reminded me of my 10th. grade shop math teacher Mr. Sturm. Like you, he was very good at explaining things so we could understand it.

Kevin

[tedsykora]

this was my first exposure to this type of setup. very interesting and logical when presented this well

[MyShopNotes]

Somehow found the time after the bash to make a vid? Wow, I know what it would take to pull off a bash, if I was you I would still be resting. Thanks for the new vid Stan,

[tommie]

Oh man, I love this kind of stuff. Thanks for sharing.

[RyanWeishalla]

Nice setup using the sine bar.  With your square compound (my Atlas isn't), much easier to use that method than the two indicator method that I tried when I setup my MT2 taper.  I pulled the bozo and didn't realize the taper was for the diameter and not per side...had to redo it a second time.

[travisshrewsbury]

great video Stan, been to school twice today

[MrPragmaticLee]

Very informative. While there are numerous ways to come up with the degrees (7.125) your compound should be set at i.e. a = arctan((D/2) - (d/2))/L, your finished product will only be as good as the accuracy of the protractor used to set the compound. Your demonstrated method of using a sine bar and stack blocks is pretty much fool proof. Looking forward to Part 2.

[JackHoying]

This info will come in hand for setting up my taper attachment in the near future.  I'm making a large taper (about 12" long) for use in as an arbor for an 3" expanding mandrel that I have. (somehow I ended up with an orphan outer expanding mandrel sleeve at an auction)

[PeterWMeek]

At about 10:00 you are determining the height of the gauge blocks using tan(theta) when you should be using sin(theta). For small angles sine and tangent are fairly close, but by 7˚ they are off by about 0.0009 in an inch and five times that for your gauge block stack.

Tangent assumes that the rolls remain the same horizontal distance apart, but as the angle increases the horizontal distance becomes smaller until at 90˚ the horizontal distance becomes zero.

The sine function assumes that the horizontal distance is irrelevant and the center to center distance is constant (in this case 5").

You need to calculate the angle accurately using the best tangent table available (or a good calculator), and then use the resulting angle and a good sine table to calculate the height of the gauge blocks.

If I calculated it correctly, your gauge block stack should be more like 0.620" rather than 0.625".

[richardhaisley]

If you have an Android phone, Suburban Tool has an application that will give you the stack for any angle.