Back in post #6, it was suggested to drill from both ends. Since a barrel need be inserted, the hole needs to be straight and drilling from both ends may not line up exactly.
But then a wandering bit will not create a straight bore either! Catch 22!
Y'all need a long router bit!:D(end mill)
Horizontal drilling pen blanks
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JPG
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
I believe the far end would be higher that the start of the hole. The table has a bit of flex in it under pressure from the quill and drill bit. When I have to drill a deep hole, I place a block under the far end of the table between the table and the way tubes. This keeps the table from "rocking" under pressure.kashman wrote: The hole through on the opposiste side was not even close to center. With the bit firmly chucked, set-up checked for accuracy and securely tightened, what caused the bit to wonder off course?
Randy S.
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Horizontal drilling of Pen blanks
I want to thank all of you who responded to my original thread. Your wisdom and experience is truly astonishing. I have had better results by taking the following actions: I have moved the table (M500) all the way to the tail stock to give it extra support as it will flex up under pressure. I have added a wooden screw clamp to the far end of the fence to ensure a true 90 degree alignment under pressure. I have gone to a shorter drill bit where applicable. I have slowed down the rpm and withdraw it many times to remove the debris.
I believe that run-out, drill bit sharpness and flex, wood grain, accuracy of set up, security of rail fixtures all play a part in getting accurate results. I really feel the biggest culprit is flex from the table in the horizontal position.
I believe that run-out, drill bit sharpness and flex, wood grain, accuracy of set up, security of rail fixtures all play a part in getting accurate results. I really feel the biggest culprit is flex from the table in the horizontal position.