rbruce2u
Member
Can anyone tell me how to prevent the CA finish from chipping when I remove the bushing from a Sierra blank. I am trying to use about 15 - 20 coats of med. CA.
Thanks for the help.
Bob
Thanks for the help.
Bob
Can anyone tell me how to prevent the CA finish from chipping when I remove the bushing from a Sierra blank. I am trying to use about 15 - 20 coats of med. CA.
Thanks for the help.
Bob
You can also use an exacto knife to score the ca while turning the head stock wheel by hand. Take the blank off the lathe, rock the bushing back and forth to snap it loose. Lay a piece of 320 on your bench, and lightly sand the ends of your blanks smooth. As said above, Delrin bushings are best for finishing with CA. You can get them from John at penturnersproducts.com
you dont need 20 coats of CA.
you dont need 3 coats of CA.
you dont need to use the BUSHING to put CA on the blank.
Some people don't turn between centers yet. To answer your question. I usually trim off the excess with a square end chisel while running, or use an exacto with the lathe off like mentioned above. Any excess after removed can be trimmed with a single edged razor blade or equivalent.
you dont need 20 coats of CA.
you dont need 3 coats of CA.
you dont need to use the BUSHING to put CA on the blank.
I use 4 layers of paper washers in between the bushes and the blank. When finished I use a sharp knife to trim the CA on the edge towards the bushing and then sand the blank with 320 grit fitted to the back of the pen mill (chuck end), a couple of turns and the jobs done.
Kryn
This problem is what drove me to TBC some years ago. On oily woods such as cocobolo and ebonies, the chips or "lifting" on the ends occured because the CA did not adhere as strongly to those woods.
I am not sure from your posts that you are using calipers yet, but that is a GREAT tool to use to up the level of skill and fit/finish. Don't rely on the size of the bushings to finish the blank but upon the calipers in measuring the nib end, center band and clip end. Mark those measurements down and then turn/sand down to just under that size. In applying CA, build up to the sizes you measured.
When finishing against the size of the "bushings" remember this: Bushings should be considered as "consumables" because you will nip them with the chisels and sand them down each time sandpaper hits them. Over 10 to 30 pens the bushing size (where it meets the blank) will be reduced, at which point it is not reliable for sizing the blank anymore. So, either buy more bushings - or learn TBC and use calipers to determine the size. While some TBC turners do not use bushings at all, many use bushings to turn the blanks to near size then remove the bushings and sand down to size without bushings. Finishing is done without the bushings. The result is that the bushings are not considered as consumables any more and will be "permanent" tools. Much cheaper in the long run!
Turning between centers comes with experience you'll get to it when your ready!
Can anyone tell me how to prevent the CA finish from chipping when I remove the bushing from a Sierra blank. I am trying to use about 15 - 20 coats of med. CA.
Thanks for the help.
Bob