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| Hollow Screw Extractor http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=21033 |
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| Author: | Chris Paulick [ Sat Feb 14, 2009 2:14 pm ] |
| Post subject: | Hollow Screw Extractor |
Anyone have one of these in 3/8" and 5/16" who can tell me what the ID is. I'm wanting to see if I can use them to cut fret board dots from shell. http://www.woodcraft.com/family.aspx?FamilyID=983 |
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| Author: | WaddyThomson [ Sat Feb 14, 2009 2:58 pm ] |
| Post subject: | Re: Hollow Screw Extractor |
I posted this at MIMF too, but doesn't the screw extractor grip/cut in the reverse direction? You would have to cut using a reversible drill. Not a major issue, but most are slow for cutting. |
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| Author: | Chris Paulick [ Sat Feb 14, 2009 3:14 pm ] |
| Post subject: | Re: Hollow Screw Extractor |
Not a problem. I'm interested in the ID. It's either one of these or I'll make template and use a collar and mill with a PC310 router. |
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| Author: | Steve Marcq [ Sat Feb 14, 2009 6:08 pm ] |
| Post subject: | Re: Hollow Screw Extractor |
I read somewhere about how to cut shell a bit oversize, then CA it onto the end of the same drill bit you'll use to drill the hole. Reverse the bit in a drill, and hold a sanding block against the spinning shell to get it to exactly the drill diameter. Haven't tried it, but I would if I wanted an odd size dot, or of a type of shell unavailable precut. Steve |
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| Author: | Mark Groza [ Sat Feb 14, 2009 8:39 pm ] |
| Post subject: | Re: Hollow Screw Extractor |
I do it like steve said.Except you should also grind the drill bit flat on the bottom so the shell has a larger area to glue it to.Works great! |
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| Author: | Stephen Boone [ Sun Feb 15, 2009 12:17 am ] |
| Post subject: | Re: Hollow Screw Extractor |
I have them and have never used them. I will try to find them tomorrow 2-15 and report then. (I think I know where they are.????) |
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| Author: | Stephen Boone [ Sun Feb 15, 2009 12:31 am ] |
| Post subject: | Re: Hollow Screw Extractor |
Well, I knew I would never get to sleep wondering where those things got to so I went downstairs and found them.... O.D. .370-I.D .311 O.D. .292-I.D. .240 O.D. .310-I.D. .250 I have three sizes unlabeled so those are the actual measurements for the three. The cutters are a bit rough so I would expect some chatter. I also had to measure several times and take a rough average. I do not think that they are precise enough for you but there you go. Hope this helps! |
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| Author: | Chris Paulick [ Sun Feb 15, 2009 9:39 am ] |
| Post subject: | Re: Hollow Screw Extractor |
Thanks Steve. I know about the drill bit thing as that's how I've made different size dots in the past . It's very time consuming and I'm looking for a faster method, Looks like I just might come up with another router jig. Maybe a road trip to Woodcraft today. |
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| Author: | ChuckB [ Sun Feb 15, 2009 4:08 pm ] |
| Post subject: | Re: Hollow Screw Extractor |
Chris, I don't think this will work on shell, but I have used a piece 3/16 brake line and sharpened the outside to a bevel, chucked in the drill press and cut cherry position markers...worked great. Chuck |
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