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| Best drill bit for 1/2" end pin hole? http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=32156 |
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| Author: | Ed Haney [ Tue May 10, 2011 3:34 pm ] |
| Post subject: | Best drill bit for 1/2" end pin hole? |
What is the best type of drill bit (brad point?) for enlarging the end pin hole for after market pickup installation? How many stages do you use in drilling to reduce risk if tear out? (pilot hole + what sizes?) Do you use blue painters tape over the existing hole or is there a better tape to reduce risk of tear out? Thanks in advance for your help and expertise! Ed |
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| Author: | meddlingfool [ Tue May 10, 2011 4:17 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
I like to use a two flute step up bit, though it can leave a bit if tearing on the inside. |
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| Author: | John Mayes [ Tue May 10, 2011 4:38 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
http://www.stewmac.com/shop/Tools/Speci ... 3&xsr=5110 I start with a .250 brad point bit, then follow up with this for the endpin jack as needed. |
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| Author: | Ed Haney [ Tue May 10, 2011 4:53 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
John Mayes wrote: http://www.stewmac.com/shop/Tools/Special_tools_for_Endpins/Endpin_Jack_Reamer.html?actn=100101&xst=3&xsr=5110 I start with a .250 brad point bit, then follow up with this for the endpin jack as needed. Thanks, John. I had forgotten about that StewMc reamer. Looks like a great low-risk method. |
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| Author: | Howard Klepper [ Tue May 10, 2011 6:03 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
1/2" step bit. http://www.amazon.com/Irwin-UniBit-16-I ... B00004THYY |
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| Author: | Ed Haney [ Tue May 10, 2011 6:18 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
Howard Klepper wrote: Thanks much for the link, Howard. This bit is MUCH cheaper than the StewMc reamer. Roughly what speed do you use? Ever have any tear out problems with it? |
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| Author: | Ed Haney [ Tue May 10, 2011 6:19 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
Double post. |
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| Author: | StevenWheeler [ Tue May 10, 2011 6:34 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
Ed, I just used the bit Howard mentioned. I don't know what rpm my drill runs at, but it's a Dewalt 18v three speed. I had it in second gear and at about 3/4's throttle. It left a nice clean hole with no tearout inside or out. Steve |
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| Author: | Dave Stewart [ Tue May 10, 2011 8:05 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
For a new hole, I find these lipped brad points from LV hard to beat. Zero tearout. http://www.leevalley.com/en/wood/page.a ... 2240,42247 |
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| Author: | jm2 [ Tue May 10, 2011 10:57 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
Dave Stewart wrote: For a new hole, I find these lipped brad points from LV hard to beat. Zero tearout. http://www.leevalley.com/en/wood/page.a ... 2240,42247 Indeed, those Lee Valley bits are stellar for all kinds of drilling, and are well worth the cost. W.L. Fuller in the U.S. also makes excellent brad point bits. In fact, they used to supply Lee Valley. I find both companies equal, but Fuller makes custom bits to spec. One thing those brad point bits do not work on is endgrain. They tend to just smoke up, especially in hard exotics. They are strictly for face or edge grain. One other thing about the Brad point bits is that they do not exit as cleanly as they enter. Ideally, some scrap material should be pressed up against the exit location, to provide edge support, for the cleanest possible exit hole. |
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| Author: | Kent Chasson [ Tue May 10, 2011 11:57 pm ] |
| Post subject: | Re: Best drill bit for 1/2" end pin hole? |
I use a step drill. About the Lee Valley bits, they are nice and cut clean but the tips are fragile and they have a tendency to keep a thin plug of wood in the bit after exiting the hole. This makes it problematic to drill successive holes without stopping the drill after each one to clean out the plug. Major pain. Where they excel is for precision location of holes for jigs and such. The fine point and accurate milling pay off there. |
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