Minutes October 27/09

October 27,20009

Miles, Lawrence, Paul, Frank Chiasson, Jim Hiltz,Chris

We reviewed the angles and formulae for the project again.

Leo talked us through the process of turning the bucket on the lathe once it is glued up.

A temporary top and bottom will be glued in place to provide for mounting with the chuck.

The outside will be turned round .

A flat will be cut to allow the steady rest to be placed.

The one end will be removed and the inside will be rounded.

Another temporary piece of wood will be used to remount the piece on the chuck from the inside and the outside will be rounded and lastly a groove for the bottom will be made.

An allen wrench has hard steel and can be shaped into a cutter to do the groove.

Paul's planer..click photo to see album and then click slide show

Paul's Planer...before and after

Minutes October 13/09

From Tapered Bucket (cooper) project

October 13, 20090 Paul, Rick, Miles, Lawrence

Leo re-explained the math of doing the stave taper, slope and bevel angles of the bucket project.

eg for a 32 stave bucket:

360/32 is 11.25 degrees;

each side is then 11.25/2=5.625 degrees

5.625/90 (degrees)=.0625

.0625 x 80 (for a 10 degree slope) =5 degrees

.0625 x 85 (for a 5 degree slope) =5.3125 degrees (or 90-5.3125, which is 84.6875 degrees)

These are the bevel angles for each stave

To gage the thickness of a turning, use an inside caliper, then an outside caliper at the same level, subtract and half this to get the thickness of the turning.

Tapered bucket (Click for a video)

September 29,, 2009

Attendance: Chris, Paul, Rick, Hiltz, Miles

Leo demonstrated how to calculate the angles needed to make a tapered bucket..the next project.

The first step is to make a drawing of the project.

Draw a large circle representing the largest diameter (top) of the bucket and inside this draw a smaller circle, representing the smaller diameter(base) of the bucket.

Draw diameters representing the total number of segments you want: eg two diameters is four segments, four is eight etc.

Measure out the width of the segments from the diagram.

Cut these a little over sized using a taper jig (10 degrees)

The jointer is used to do the bevels.

Two passes on each side generally do.

Calculating the bevel angle:

360/# segments

eg 360/24=15

15/2 is 7.5 degrees (each side)

7.5/90 is 0.083

The slope will be 10 degrees

0.083 x 10 = .83

The angle needed is 8.3 degrees

See utube http://www.youtube.com/watch?v=3z4dMBNCSAg

Also this :

The chord of a segment of a curve =2 times radius times sin (central angle /2)
Say the bucket top is 16” inside diameter with 12 staves
A circle is 360 degrees, so the central angle for each stave is 30 degrees (360/12)
The radius is 8” or half the 16” inside diameter.
So, the inside measurement of each stave top is 2 times 8 times sin (30/2) = 4.14”
Say the bucket bottom is 12” inside diameter. The central angle is still 30 degrees.
The inside measurement of each stave bottom is 2 times 6 times sin (30/2) = 3.11”

The stave angle is half the central angle or 15 degrees for 12 staves.