projects:crokinole_board:work_logs:work_log_4
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projects:crokinole_board:work_logs:work_log_4 [2019/07/08 11:46] – [What I want to accomplish next time] tjhowse | projects:crokinole_board:work_logs:work_log_4 [2019/07/10 12:34] – tjhowse | ||
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====== What I want to accomplish ====== | ====== What I want to accomplish ====== | ||
- | * Cut out the main board. | + | * Determine how to mark the lines on the board. |
====== What I've done ====== | ====== What I've done ====== | ||
- | === Aaarrgh! Scary! | + | === Experiments |
+ | Other people have used V-shaped router bits to gouge the circles and lines into the board, then filled them with paint. I did a few experiments with that technique and found it hard to get reliable results. If it goes wrong the entire top board is a write-off, so I was very nervous. If the pivot point moves by a tiny amount the circle won't meet up at the end of the sweep, and that would be unfixable. The specification calls for the lines to be between 1/16" and 1/8". It didn't take much slop in the system for the depth and cleanliness of the cut to be significantly affected. | ||
- | I worried for a long time about this, and did lots of test cuts and preparation. It was the only nice piece of plywood for a reasonable price I could fit in my car. If I ruined it I'd have to spend more time and money getting a new bit. Stakes were high. My woodshopping table had a bend in it, so I belted it with a hammer | + | {{: |
+ | I attached | ||
- | === Cut === | + | Instead I decided to go with a black permanent marker. I can easily build a lightweight circle-drawing jig. If it goes bad I can simply wipe off the ink with a solvent. I ran some trials and got some good data. |
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- | Marvellous! Nice sharp edges, no wonky bits. Two minor burn marks where I had to stop and change arm positions, but they will sand out easily. I exposed three minor voids in the edge as I was cutting. I haven' | + | {{: |
+ | The marker | ||
- | I gave the circle a light sand with some 180 grit sandpaper | + | I had gone through five varnish -> light sand cycles to this piece of scrap ply before drawing on it with the marker. I drew some straight-ish lines, a black patch and a big squiggle then let the ink dry for half an hour. I then drew some fresh lines as a comparison a few minutes before varnishing. I noticed that some of the ink had wicked out slightly |
- | I came back to my workshop | + | The ink did not streak or bleed during or after the varnishing! Great success! |
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+ | After that coat of varnish had dried I gave it a light sand in preparation for another coat. I think I sanded | ||
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+ | I think my solution to this will be ensuring my varnish sandings are sufficiently gentle, and perhaps re-marking lines if they start to fade during the subsequent varnish layers. Overall I think this technique looks great and it's likely the one I'll be using on the final board. | ||
====== What I want to accomplish next time ====== | ====== What I want to accomplish next time ====== | ||
- | * Varnish a piece of scrap ply and sand it, then varnish it, then sand it... | + | * Cut out the top, |
- | * Work out how to mark the lines on the board. | + | * Glue the offcuts |
+ | * Drill the hole in the centre of the top, | ||
+ | * Attach |
projects/crokinole_board/work_logs/work_log_4.txt · Last modified: 2022/01/23 00:23 by tjhowse