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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
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off center turning
when i mounted a wood block off center about a half inch, it made the lathe
vibrate badly and that was turning slow...didn't dare take it up faster. am trying to turn a three cornered, curved bowl. should i screw it to the face plate waste block or will gluing it do? if i get to turning it and it comes off, then it would have more than usual momentum! advice wanted before I kill me or the house. rich -- atv rider polaris 500 glass creations drz400s wood carver spode |
#2
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You are not giving us much information -- certainly not enough for us to be of help. Is the
blank 3" diameter or 30" diameter? What does it weigh? How slow is slow? What machine are you turning on? Is the outside shape to be 3 cornered or both the outside and inside shapes? Please get some more advice before you try this again. Bill In article xtsod.808$Rs2.4@trnddc03, says... when i mounted a wood block off center about a half inch, it made the lathe vibrate badly and that was turning slow...didn't dare take it up faster. am trying to turn a three cornered, curved bowl. should i screw it to the face plate waste block or will gluing it do? if i get to turning it and it comes off, then it would have more than usual momentum! advice wanted before I kill me or the house. rich |
#3
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"res055a5" wrote in message news:xtsod.808$Rs2.4@trnddc03... when i mounted a wood block off center about a half inch, it made the lathe vibrate badly and that was turning slow...didn't dare take it up faster. am trying to turn a three cornered, curved bowl. should i screw it to the face plate waste block or will gluing it do? if i get to turning it and it comes off, then it would have more than usual momentum! advice wanted before I kill me or the house. rich ======================= Rich, I advise keeping the work piece between centers for the whole operation, except finishing the bottom. This will greatly reduce the possibility of launching an unguided missle! :-) Start by finding the center of the piece. Mount it "on center" and rotate it slowly and mark a circle of about where you want the outer diameter of the bowl/dish to be. Stop the lathe, remove the piece, do an equal size circle on the reverse side. Now, mark off the circle on one side into 3 equal segments and mark with an awl or nail for use as attachment points for the centers. Transfer those points to the other side so that you have the 3 marks directly opposite each other. Now chose one set of those marks and attach the work piece. Turn down to the circle oposite your centers, move to the other 2 points and repeat the process. Now you should have your triangular shape. The hollowing may be done using the center points for a circular dish-out, or the 3 outer points for a pocketed dish. Same with shaping the outside, depending on how you want the finished shape to be. (the outside shaping would usually be done as you're shaping the triangular shape, or "on center" for a round shape. Hope this is clear enough to follow. Ken Moon Webberville, TX |
#4
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~600 rpm.
Use a square to transfer down the edge, same as regular woodwork. Always use that extra hand - tailstock - even if it seems slightly in the way, until your piece is at best balance. Never scrape what you can cut. Stresses the entire setup more, and makes an inferior surface. You can also play the game with pin jaws and three holes in a glue block. Almost sounds like a song lyric, doesn't it? "res055a5" wrote in message news:Zhvod.828$Rs2.355@trnddc03... how do i transfer those three marks? i can divide the marked circle into thirds, but how do i line up one mark to another on the other end of the wood? thanks for the advice...guess i forgot to include some information. I am using an ancient delta lathe. the piece i was turning is 4" o.dia., 4" long, cherry wood. I was trying to turn the outside. speed, i don't know because this ancient lathe has 4 pulleys and i was on th e slowest pulley, but i don't know the motor speed. I was not using the tailstock and had it just glued to a piece of waste wood that was screwed to the faceplate....it didn't come off the wastewood, but i shut off the lathe as quickly as i could and removed it from the lathe until i could get more advice. |
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