okiebugg
Member
You can buy Teflon or Delrin fairly cheaply from Ebay I buy 1 1/2" thick 6" X 6" chunks from time to time. Other sizes are available.
These bushings are used for finishing your pen with CA, because CA won't stick to Teflon/Delrin
Cut into pieces 3/4" X 3/4" (not critical) about 6" long. Between centers, turn to round using your drive center. I use the skew as a scraper
Mount it to your chuck. Your live center needs to be just kissing the teflon/Delrin. If you use too much pressure, it will deform the cylinder you just turned along the length
Drill to .248 to .250. using a drill mounted on the tailstock These measurements need to be accurate . mic your drill bit and mic your mandrel. Too large, it will drill out of round on your mandrel later or too small it wont fit . Just lightly kiss your piece to the drill bit when drilling so it won't deform the length of the cylinder
turn a 3/4 " part of the cylinder to approx 3/4" length. Again this is not a critical length. You will start turning them a shorter length to save your teflon. Tool pressure should be minimal because the teflon/delrin turns like 'melted butter' . I use the skew laying down on the tool rest as a scraper
You can turn the cone shaped mandrel bushings into a double cone shape. The center of the cone on mine is turned to about .375" (again not very critical). Turn the rt end down until you have a flat on the rt end to mate to to your mandrel when using for finishing
This drawing using paint is almost Neanderthal. It is an exaggerated drawing of the bushing Go below the drawing for the rest of the verbage
Do the Rt end first so you can have the support of the cylinder to turn the L end until it separates from the cylinder. By doing this, the Rt end will mate to your mandrel nut using a small washer and the Lt end will slip into the end of your pen blank when using them. You have one bushing. shape is not critical unless you are a perfectionist. Be careful because the teflon/delrin, drilled, has little stability. With a few turned, you will become proficient in shape and diameters.
I also turn separate bushings to the same size as 7mm pens for use on slim lines. Those already turned won't slip into the larger pen blanks
I have pictures if you need them and will upload them if you want.
I hope I haven't left anything out.....:biggrin:
These bushings are used for finishing your pen with CA, because CA won't stick to Teflon/Delrin
Cut into pieces 3/4" X 3/4" (not critical) about 6" long. Between centers, turn to round using your drive center. I use the skew as a scraper
Mount it to your chuck. Your live center needs to be just kissing the teflon/Delrin. If you use too much pressure, it will deform the cylinder you just turned along the length
Drill to .248 to .250. using a drill mounted on the tailstock These measurements need to be accurate . mic your drill bit and mic your mandrel. Too large, it will drill out of round on your mandrel later or too small it wont fit . Just lightly kiss your piece to the drill bit when drilling so it won't deform the length of the cylinder
turn a 3/4 " part of the cylinder to approx 3/4" length. Again this is not a critical length. You will start turning them a shorter length to save your teflon. Tool pressure should be minimal because the teflon/delrin turns like 'melted butter' . I use the skew laying down on the tool rest as a scraper
You can turn the cone shaped mandrel bushings into a double cone shape. The center of the cone on mine is turned to about .375" (again not very critical). Turn the rt end down until you have a flat on the rt end to mate to to your mandrel when using for finishing
This drawing using paint is almost Neanderthal. It is an exaggerated drawing of the bushing Go below the drawing for the rest of the verbage
Do the Rt end first so you can have the support of the cylinder to turn the L end until it separates from the cylinder. By doing this, the Rt end will mate to your mandrel nut using a small washer and the Lt end will slip into the end of your pen blank when using them. You have one bushing. shape is not critical unless you are a perfectionist. Be careful because the teflon/delrin, drilled, has little stability. With a few turned, you will become proficient in shape and diameters.
I also turn separate bushings to the same size as 7mm pens for use on slim lines. Those already turned won't slip into the larger pen blanks
I have pictures if you need them and will upload them if you want.
I hope I haven't left anything out.....:biggrin:
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