Long weekend progress.

April 9th, 2012

Long weekends are good for getting things done!

Joss popped in yesterday morning to see how I was doing and suggested a few tweaks. Today I tweaked the rear hoops some more, moving the front one back about an inch and a half and also reshaping the rear one. Things seem to work better now.

IMG_1909_1 IMG_1910_1 Reshaped rear hoops.

The other thing I did was a small distraction. I keep an eye on TradeMe for various useful car bits and tools. One thing that came up was a tyre pressure gauge form 1937, the same year as the car. No one else bid so I got it cheap. I pulled it all apart and found the leather seals in it were all shot. I cleaned it all up and replaced the seals with o-rings and put it back together. Calibrating it was an interesting problem but close examination shows how it is done.

Inside there is a spring with with a sealed plug on one end (like a piston). When you push the gauge on a tyre valve the air flows into it and pushes up the piston against the spring tension. The spring/piston pushes on the display rod which slides inside the outer body. This has a small clip on it’s base (a circle of spring wire) on it to provide friction so the piston can push the display out and then the rod will stay at that position when the piston springs back. The display rod is a nice, 6 sided thing with the measurements staggered around it.

IMG_1914_1 IMG_1916_1 IMG_1918_1

The seal in the head was shot so I replaced that with a small disc of rubber I cut out. Everything else cleaned up well. Calibrating it is done by screwing the brass ends on the spring in and out changing it’s length.

IMG_1919_1 IMG_1920_1 IMG_1922_1

You can see how the spring screws onto the brass ends as well as the two o-rings I used to replace the original leather cup washer which had perished. The spring piston slides into the end of the gauge and the head screws on over it holding it in place. I simply used another tyre gauge and adjusted the spring length until the two read the same. They read identically over the range I measured, from 20 to about 45 PSI.

It all cleaned up really well and works nicely.

IMG_1923_1 Finished gauge.

The markings on it say: Kismet Tyre Gauge Balloon Model.

It is a very pleasing thing. From when they made things well.

The other thing I did today was to screw the firewall to the main frame. I used 3/16th stove boltsĀ  since that’s what I have that looks sort of right. They will do for now. And this frees up loads of clamps for other things.

IMG_1924_1 Firewall attached.

Finally I did a small test that Joss mentioned. Can I fit my wicker picnic basket in the boot of the car? The answer is yes!

IMG_1929_1 Picnic!

Will obviously fit better once all the temporary supports are gone and the floor removed.

Next weekend is the Roycroft trophy weekend at Hampton Downs so I won’t be doing anything on the car but will instead be watching the racing, talking to people and getting ideas and measurements and photos to help me on my car.

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