How To Make A Clock In The Home Machine Shop, Part 11, by Clickspring.
There are quite a few fasteners that need to be made for this clock, and I thought it was about time I showed the whole process from start to finish. Making custom screws is quite a time consuming process, but I think ultimately it adds quite a lot to the character of the clock.
Plenty of small lathe work, some freehand turning, as well as final finishing with oilstone powder, diamantine and heat blueing.
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Cameras used in this video:
Panasonic GH5 - amzn.to/2rEzhh2
Panasonic X920 - amzn.to/2wzxxdT
Tools & Shop Products:
Dykem 80300 Steel Blue Layout Fluid, Brush-in-Cap (4oz): amzn.to/2HGPaJJ
"Solidworks 2013 Bible": amzn.to/2FObS1D
"Machinery's handbook": amzn.to/2pi7XE5
Sherline Lathe: amzn.to/2pnXM19
Sherline WW collets: amzn.to/2FYZ7F8
Saint Gobain (Norton) - 4 Arkansas Stones + case: amzn.to/2HCOAMX
For more info on this build, as well as other tool making info and plans, visit www.clickspring...
Ask Me A Question:
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Abbreviated Transcript:
0:00:08 In this video, I go through the process of making a set of screws to fasten the chapter ring to the inside of the bezel. My main priority with these screws is to make them look unobtrusive as they do the job of holding the chapter ring in place.
0:01:08 Next I formed the thread, and it was these bezel screws, as well as the other screws for this clock that motivated me to make the tailstock die holder for my Sherline lathe.
0:01:51 The ends of the screws need to be reduced a little in length, and then domed, which is another great excuse to bring out the t-test and do a little hand turning. With the thread complete, the next job is to form the screwdriver slot. The work was parted off a little over length, and then re-chucked the other way around.
0:02:45 Now in a previous video I formed the screwdriver slots using a slitting saw on the mill, so in this video I thought I'd do it by hand, using some fine cut files. With the screwdriver slot formed, the head can now be trimmed to length, and I can get the screw prepared for heat treating.
0:03:45 One of the things I that I'd like to avoid is the build up of black scale that usually occurs during the heat treating process. So I'm enclosing the screws inside this small wire basket, and then coating them in a mix of boric acid and denatured alcohol.
0:04:00 The boric acid forms a protective coating over the metal and reduces the oxidation to a minimum. Once the screws have been quenched, that coating can be either chipped off, or simply washed off with boiling water. Now the screws need to be tempered before I start the polishing.
0:04:29 Which means I need a fresh metal surface to monitor the color change, so I took care of that on the lathe using this tailstock polishing tool. The temper color I'm aiming for is blue, but at this stage, I'm not overly concerned about the quality of the color. I'll put a better quality blue on the surface as the last step, after the screw has been polished.
0:05:36 A quick clean off with some paraffin, and then I followed up with some of this extra fine diamantine, also on pegwood
0:06:53 The screw was then reversed, and the same process used on the top face. And again I'm using the circular lap, to make sure I grind the face flat with crisp corners. I'm starting with oilstone paste on an mild steel lap.
0:07:16 And then I followed up with diamantine on a tin lap for the final polish. The edge of the screw was treated in a similar way, first with emery paper, followed by diamantine on a brass polisher.
0:08:01 I also brightened up the screwdriver slot with diamantine, and then gave the edges a very light bevel with a triangular shaped slipstone. So with all of the surfaces polished, the final step is to give the screw a nice blued appearance.
0:08:19 As before I'm using a butane torch and brass shavings, but this time I'm being a lot more careful about how the color turns out. The screw surface is as clean as I can get it, and I'm keeping an eye out for any parts that change color too rapidly.
Music:
"Manifested" By Ketsa.
www.ketsamusic.com
References:
John Wilding "Large Wheel Skeleton Clock" construction book can be purchased online from Ian T Cobb:
www.clockmaking...
How To Make A Clock In The Home Machine Shop, Part 11, by Clickspring.
28 сен 2024
