Just to add a bit to John's mailing, I use perspex sheet to make dials
attached to a regular knob by scribing out a circle slightly larger than you
need. I then roughly saw it into a hehagonal shape to get rid of most of
the pointy bits. A deep score line fron the centre to the edge allows you to
fil it with wax coluring of your choosing after finishing. Then run a 1/4"
drill through the middle and bolt it up tight to a 1/4" bolt. This act as
the spindle for a drill chuck that is clamped on my bench. A medium file
held carefully over the edge of the perspex that is spinning away from you
will take the edge down to a smooth but translucent edge. A bit of Brasso
or jewellers rouge on a rag wrapped around the file will polish it to a
transparent finish and you can of course round off the edges to make it
smooth.. Finally set it on a shaft and araldite the disk to the knob (score
lline towards the panel).
----- Original Message -----
From: "John E. Beech" <[EMAIL PROTECTED]>
Hi Andy,
First off, does the whole knob need to be 2 " diam.? ie.
would a disc attached to an "ordinary size knob do the trick?
Failing that, you can make perfectly servicable knobs from the smaller
size coffee jar lids. Cannabalize a small knob for the brass insert to
fit the shaft. Centre this accurately in the lid and glue into place
with araldite. You can fill the remaining space with David's Isopon
paste ( cheaper than araldite ). This will add weight for a VFO dial. If
you don't have the brass fiitings and your shafts have flats on them you
can caste the paste around a greased sfhaft & then cross drill to take a
pinch bolt. Threads can be cut in isopon if you are careful.
The hardest job will be finding the centre of the lid -- you
need to carefully apply some basic geometry. If you don't like the brown
colour, be careful with the paint you apply as most of these lids are
moulded from a polystyrene based polymer, which dissolves in most
organic solvents.
That's assuming you don't have access to a lathe. If you do
just turn siome pieces of wood etc and paint them!
de John G8SEQ.
Andy - GM0NWI wrote:
Hello to everyone in the group from "Bonnie Scotland"..
I am currently tryin' to source some 2 inch - 2 1/4 inch diameter knobs
for
a project that will be gettin' undertaken in
The near future..
Has anyone in the past home-brewed this size and diameter of knob for a
past
project..? If so, care to share how you
Did it..?
=== Via the mailing list of the GQRP Club www.gqrp.com ===
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/GQRP/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/GQRP/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:[EMAIL PROTECTED]
mailto:[EMAIL PROTECTED]
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
______________________________________________________________
QRP-L mailing list
Home: http://mailman.qth.net/mailman/listinfo/qrp-l
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[EMAIL PROTECTED]
