|
If you would like to be notified when I post a new article, send me an email. I'll only use the list for that purpose, and I'll mail blind cc so your address won't be any the worse for spam. Pencil Holder as 6 page pdf Pencil Holder Introduction
This article shows how to make pencil holders based on a
sphere. Instead of costly and
distracting hardware a stepped drilled hole holds the pencil (or pen) and
protects the point, The first pencil
holder is a simple one, but it looks complicated due to being turned from a
blank of Baltic birch plywood. One of the nice things about turning spheres is once you
have a sphere chuck you can orient them however you like to turn decorative
cuts. The second pencil holder is
Maple and has four burned intertwined lines. Figure #1: Two
Pencil Holders. The First Pencil Holder
Prepping the Blank
The first pencil holder has no turned decorations, so it’s
better for wood with flashy figure or glued up blanks.
The photos will follow using a blank with four Baltic birch plywood
pieces glued around a Baltic birch core. I think 2-1/2” in diameter is a good size for a pencil
holder. Leaving 1/2” nubs on each
end for ease of turning means the blank should be 2-1/2”x2-1/2”x3-1/2”.
If your plywood is 3/4” thick, that means the core will have to be
1”x1”x3-1/2”. I suggest gluing
pieces of plywood together and then cutting the core to size on a table saw. The side pieces that are glued around the core should be
3-1/2”x1-3/4”x3/4”. Glue the pieces
around the core one at a time in a pinwheel fashion. Take extra care when gluing
on the first piece that the edge lines up with the adjacent face of the core.
Figure #2 shows the glued up blank from one end. Figure #2: The
Baltic Birch Blank. Turning the Sphere
Begin by mounting the blank between centers.
If you are using a blank glued up of Baltic birch plywood, or any other
glued up pattern, take care to center the blank carefully.
Again, for a Baltic birch plywood blank, orient the blank so that the
plywood layers support each other as they are being cut as in Figure #3. Figure #3: Orient the blank to best prevent tear out. Turn the blank round and indicate the center of the blank
with a pencil line as in Figure #4.
Despite being glued up from Baltic birch plywood, this is spindle turning so you
can use a spindle roughing gauge and other spindle tools.
Then turn the blank into a sphere using your favorite method as in Figure
#5. My favorite method
is the
Shadow Sphere . It’s okay to
leave the nubs for now as they’ll help orient the sphere for the next steps.
Figure #4: Turn
the blank to a cylinder. Figure #5: Turn
the cylinder into a sphere. Turn the Top Half
Using your tailstock center and one of the nubs to aid in
alignment, mount the sphere in a
sphere chuck (Unless you want to have mounts for more than one pencil as you
do not need the sliding feature) in Figure #6.
Remove the nub as in Figure #7.
Figure #6:
Mount the sphere in a sphere chuck.
Figure #7:
Remove the nub. Now sand the top half of the sphere.
If desired you can polish the top half with friction polish as in Figure
#8.
Figure #8: Sand the top half and polish if desired. Turn the Bottom Half
Turn the sphere around and remount it again using the
tailstock center and nub for alignment as in Figure #9.
Remove the nub as in Figure #10.
Figure #9:
Remount the sphere for turning the bottom.
Figure #10:
Remove the nub. Turn a slightly concave recess on the bottom to give the
pencil holder a base to sit on as in Figure #11.
I used a small bowl gouge for this as it felt more comfortable than using
spindle tools. Sand and optionally
friction polish the bottom half as in Figure #12.
Figure #11:
Turn a concave recess as a base.
Figure #12:
Sand and optionally polish the base. Drill a Hole for the Pencil
Remove the sphere from the sphere chuck.
Place a piece of masking tape over the general area you want to drill to
hold a pencil. Set the sphere on its base.
Pick up a pencil and use it to mark on the tape where you want it to be
as in Figure #13.
Figure #13:
Mark placement for drilling. We will use a step-drilling process so that the pencil does
not bottom out in the hole and break its point.
A 5/16” hole will be drilled 5/8” deep, measured from the shoulder of the
drill, followed by a 7/32” hole 1-1/2” deep.
Figure #14 shows a cut-away block of wood drilled like this and how it
protects the pencil point. This size
hole works well for most standard #2 pencils.
If you want to mount something else you can measure the diameters and do
some trials in scrap wood. Figure #14: A
cut-away step drilling example. Use an awl to make a dent at the drilling mark.
Then use a cone tailstock center as an alignment aid to mount the sphere
in the sphere chuck as in Figure #15.
Figure #15:
Mount the sphere for drilling. Now drill the pencil hole in steps.
First use a combined drill and countersink to start the hole as in Figure
#16. Then drill 5/8” deep with a
5/16” drill as in Figure #17. Then
drill 1-1/2” deep with a 7/32” drill as in Figure #18.
Figure #16:
Start a centered hole with a combined drill and countersink. Figure #17:
Drill 5/8” deep with a 5/16” drill.
Figure #18:
Drill 1-1/2” deep with a 7/32” drill. You can use abrasive rolled into a steep conical point to
debur and chamfer the hole entrance as in Figure #19.
If you wish to avoid exposing the raw wood at the top of the hole you can
use a cotton swab to apply some lacquer sanding sealer or other finish inside
the hole. If you used friction
polish, touch up the polish around the hole.
Figure #19: Chamfer
and sand the rim of the hole with abrasives. The Completed Pencil Holder
Figure #20 shows the completed Baltic birch plywood pencil
holder. Figure #21 shows the pencil
holder with a rather decrepit pencil.
Figure #20: The
completed Pencil Holder.
Figure #21: The
completed Pencil Holder with a pencil. The Second Pencil Holder
Planning the Intertwined Circles
The second pencil holder starts with plainer wood and has
four intertwined circles perhaps reminiscent of a Celtic knot.
The photos will follow using wire burned lines, but inlaid wire, or
colored infill would work the same way.
After some experimentation the best method I found to determine the
placement of the lines was to determine the axis the sphere should be mounted
on. The first step is to determine how wide the pattern will
be. As the pattern reminds me of a
sine wave I’ve chosen to call this the “amplitude”, as shown in Figure #22.
Figure #22:
Decide on an “amplitude”, or width, of your pattern. Turn a sphere with nubs attached.
I usually make (and leave) a line at the middle of the sphere.
If you don’t, measure and make a line at the halfway point between the
nubs. Set calipers to the amplitude
you desire and straddle the tailstock nub with the calipers and make a circle.
Use your lathe indexer to make marks on the circles that are 90° apart as
in Figure #23. The marks on the
circle at the tailstock end indicate the axis the sphere should be mounted on.
The marks on the equator circle indicate where the line should cross the
equator. Figure #23:
Make marks on the circles 90° apart. Figure #24 shows the simple jig I made to mark turnings
while using the indexing feature of the lathe.
I used PVC and Masonite, but other materials will work (for instance a
partially threaded bolt the diameter of your banjo and plywood).
First I cut a length of PVC rod long enough to reach the center of the
lathe. Check to make sure the post
fits in your lathe banjo before going any further.
I cut a 2”x3” rectangle of 1” PVC sheet.
I joined them together with a mortice and tenon which was locked with a
wood screw driven in from the nearest side.
I made a locking collar out of PVC.
I made the diameter of the collar big enough to completely engage a
1/4x5/8” set screw. I cut a
rectangle of 1/4” Masonite and drilled a hole in it that matched the post.
I set the locking collar so that the top of the platform was at center
lathe height when the Masonite was under the post.
The platform will be at center height with the Masonite under the collar.
Or take the Masonite off the post, and any piece of 1/4” Masonite cut to
special shapes will be at center height.
The Masonite in the photos has a concave edge that approximates the
diameter of the sphere.
Figure #24: A
homemade marking platform. Mount the sphere in a sphere chuck using the tailstock
center for removing the nub as in Figure #25.
Turn the nub away. Mark the
axis of the sphere with an easily visible bullseye as in Figure #26.
In Figure #26 you can more clearly see the marks made on the smaller
circle to align the axis for the intertwined circle.
I numbered them to avoid remounting the sphere on an already used axis.
Remount the sphere using the tailstock center to remove second nub and
again plainly mark the axis.
Figure #25:
Mount the sphere for nub removal.
Figure #26:
Plainly mark the lathe axis after removing the nub. Turn and Burn the Intertwined Circles
Mount the sphere in a sphere chuck aligned with one of the
intertwined circle axis marks. You
can use the point of a conical center, or a small drill mounted in a drill chuck
to align the sphere. However the
point will dent the wood so it can’t touch to hold the sphere in place while you
secure it in the chuck. To avoid
needing three or four hands I made a
Sphere Alignment Center (henceforth
SAC). The end of the SAC is padded
with 2mm craft foam and is flat so it won’t dent the wood.
There’s a small axial hole at
the end drilled through to a 1/2” cross-hole.
There’s a 45° beveled and mirrored insert that goes in the cross-hole so
you can see through the axial hole to align to the mark as in Figure #27.
You can leave the SAC in to secure the sphere, but remove the mirrored
insert before turning the lathe on.
Figure #27:
Align the sphere using the Sphere Alignment Center. Mark for the cut using this axis by making a circle that
goes through the mark on the equator 90° from the axial mark as shown in Figure
#28. Turn a V-cut or a mini-cove as
in Figure #29. Then use (handled!)
steel wire to burn in a line as shown in Figure #30.
It is absolutely necessary that the steel wire be attached to handles and
that you only hold on to the handles.
It is nice to have a range of handled wire diameters available as the
results look quite different.
Figure #28:
Mark for the cut.
Figure #29: Cut
a mini-cove. Figure #30:
Burn a line in the cut. Using the same sequence, mark, turn, and burn the remaining
lines as in Figure #31. Figure #31:
Mark, turn, and burn the other three lines. Sand and Finish
Remount the sphere using the mark on original axis that you
marked when removing the nub as in Figure #32.
Sand the top half of the pencil holder as in Figure #33.
Optionally apply friction polish to the top half.
Figure #32:
Remount the sphere on its original axis.
Figure #33:
Sand the top half of the pencil holder. Reverse the sphere using the other original axis mark.
Turn a slightly concave recess to give the pencil holder a base to sit on
as in Figure #34. Then sand the
bottom half of the pencil holder as in Figure #35, and optionally apply friction
polish. Mark and step-drill a hole
for a pencil as was done for the first pencil holder. Figure #34:
Turn a base. Figure #35:
Sand the bottom half of the pencil holder. For this pencil holder I used rattle-can spray lacquer.
Sharpen a 1/4” dowel in a pencil sharpener.
Insert the pointed end of the dowel in the hole drilled for the pencil.
You can then spray the entire pencil holder while holding on to the dowel as in
Figure #36. Put the other end of the
dowel in a hole drilled in a block of wood to hold the pencil holder while the
lacquer dries. Put on several coats.
If you use a 3M #7448 pad on the lacquer and then buff with carnuba wax
it yields a finish pleasing to the sight and touch.
Figure #36: Use
a sharpened dowel to hold the pencil sharpener while spraying lacquer. The finished pencil holder with burned lines is shown in
Figure #37.
Figure #37: The
second finished pencil holder.
|