Meant to type "The credit for this result may *rest* in the quality of the keys." On Sat, Jan 2, 2010 at 9:21 PM, Duane McGuire <pianoman at duanemcguire.com>wrote: > I've done exactly one set of keys with it, and it produced a uniform 1 mm > deep cut across the key surface. The credit for this result may result in > the quality of the keys. I'll watch for issues with the next set of > keys. It was nice to see the other approaches out there too. > > > On Sat, Jan 2, 2010 at 8:58 PM, <erwinspiano at aol.com> wrote: > >> *HI Duane* >> * Thanks for the pics and the effort to share this. I had forgotten >> about this. Do you have any of the issues that Greg was sharing by using the >> side of the key as a reference instead of the bottom?* >> * * >> * Well done* >> * Dale* >> >> >> >> In one of the PVC-E threads, Dale Erwin asked what is being used for >> keytop planing. Here I will describe what I built recently for my >> current project and learning exercise. I was very pleased with the >> operation and accuracy. >> >> I built an overhead router setup based on the concepts presented by >> Bill Spurlock in the March 1991 issue of the Journal. His fixture of >> the time was based on a drill press rotary planer. I adapted the >> concepts to a the overhead router setup. One item that is not clear >> from the pictures is that a dust collection port is attached to the >> rear of the fixture. I think that is essential. Notably as built, >> it does not address Dale's concern about tapered keys. The jig >> registers on the bottom and side of the key. >> >> Photo A shows the overhead router setup with a key ready for planing. >> >> Photo B shows the key after exiting the jig. Note that the clamping >> mechanism is a simple, quick lever which holds adequately and keeps >> the process moving. The loose plate between the key and lever is >> coated on the lever side with some beads of hot glue, to provide >> gripping surface that would not be present in the hard maple. The >> router bit is a 1-1/2 diameter flat cutting bit. Since the key is less >> than 1 inch across, this diameter provides a cutting surface for both >> left side and right side of the key. Order of operation is: >> >> 1) With jig against right shoulder insert into about 1/4 inch. move to >> the left to plane the front edge of of the key (and the existing key >> front). >> 2) Slide the sled in to plane the left side of the key. >> 3) Move the sled to the right, forming the nice edge at the back of the key. >> 4) Pull the sled out to plane the right side of the key. >> >> This order of operation will provide for proper rotation orientation >> of the cutterhead and produce a splinter free surface. >> >> The width between sides of the jig is 300 mm. The sled is 262 mm wide. >> Other dimensions are determined by the key. Photo C is my working >> sketch for building the fixture. It is not an “as built” diagram, >> since I went direct from concept to finished product. In particular >> the sled and base are longer than indicated in the sketch. They were >> built to a more “comfortable” length. >> >> The base and sled are made of melamine faced particle board for >> slipperiness. The plated hardware on the front of the slide are >> rollers sold as sliding door glides at the local Lowes hardware. The >> purpose is to make the cross cut smooth. Also by using the roller >> point above the floor of the jig, any chips/debris that the dust >> collection misses will not interfere with a true reference to complete >> the straight cut at the back of the key. >> >> I found that the simple quick clamp was trouble free and solid for >> this key set. Another clamp at the rear of the ivoried section would >> provide additional security. I was going for for the min-max of >> hardware/accuracy. For this key set it met all of my expectations. I >> expect it will evolve some with different key sets in the future. >> >> Photo D is the result. >> >> Full resolution photos are available here:http://www.flickr.com/photos/duanemcguire/sets/72157622759095507/ >> >> >> >> >> >> >> -- >> Duane McGuire >> 801-830-5858http://blog.duanemcguire.com >> >> >> > > > > -- Duane McGuire 801-830-5858 http://blog.duanemcguire.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100102/c1f7e5e9/attachment-0001.htm>
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