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Type: Posts; User: Dave S

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  1. Replies
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    Square bits can be reshaped. Not sure if they are...

    Square bits can be reshaped. Not sure if they are hardened, but a diamond file would work in any case

    Dave
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    Yep the whole Bird experience was good. Phoned...

    Yep the whole Bird experience was good. Phoned them up and headed down for a test ride. Geometry has changed a lot since the Enduro - mine was the monocoque one - but the ride on this is brill. ...
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    I used to ride a Specialized Enduro, but a light...

    I used to ride a Specialized Enduro, but a light fingered oik knicked it. I replaced it with a Bird
    https://i.postimg.cc/Z5nMPHjg/80-F9-A871-2368-4598-B1-F5-15-D5-E3-DC6749.jpg
    Awesome bike, proper...
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    1 agp/pci shared (graphics card in AGP) 4 PCI and...

    1 agp/pci shared (graphics card in AGP) 4 PCI and 2 full sized ISA slots
    https://i.postimg.cc/9FQF6nfy/8-AF1124-E-0-E62-4-F67-A30-C-5-B1-B57-EEB3-E4.jpg
    Gigabyte GA-6BXE motherboard circa 1998...
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    I think the mini tower in the garage roof has ISA...

    I think the mini tower in the garage roof has ISA slots. IIRC itís a P2 motherboard. Iíll have a look later ( Itís nearly food oíclock here)

    Dave
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    I did contemplate that, but I need to practice :)...

    I did contemplate that, but I need to practice :)

    Dave
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    SWMBO Watch repair

    The other day the crystal "fell out" of SWMBO red Radley watch.
    No idea why, but it didn't end well for the crystal.

    https://i.postimg.cc/nc164xNW/IMG-7307.jpg

    After a rummage through my box...
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    Guess my lack of training. I have always regarded...

    Guess my lack of training. I have always regarded glass as fragile with a brittle failure mode. Gently warming on a lightbulb is quite controlled (in an engineering sort of way) and then the...
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    Not paying attention. Acrylic not glass... Heat...

    Not paying attention. Acrylic not glass...
    Heat bad for plastic
    The pocket watch crystal was glass
    Dave
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    Does the crystal fit directly into the case? If...

    Does the crystal fit directly into the case?
    If so then it is possible to fit by slightly expanding the case :)
    Last time I did that was with a pocket watch, with a similar ďknife edgedĒ crystal....
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    Laser sintered? Dave

    Laser sintered?
    Dave
  12. Thread: BST repair

    by Dave S
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    BST repair

    We have a clock in the kitchen, cheap quartz one, I think from Tesco some years ago.
    Anyway SWMBO likes it, and a couple of months ago the seconds hand stopped - it just hangs at 6 oclock and doesnt...
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    Cutter holder made, now its time to sort the...

    Cutter holder made, now its time to sort the blank ready for machining.
    Much the same as for the wheels, knock a hole in the middle, mount on the mandrel and true up in the lathe
    ...
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    In a minor cockup I made the tool from 5/16th...

    In a minor cockup I made the tool from 5/16th HSS. Turns out that the boring bar holder I indented to use it with would work with 1/4", but 5/16 puts the cutting edge in the wrong place.
    *Sigh*...
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    Glad people are enjoying it. I find it nice to...

    Glad people are enjoying it.
    I find it nice to share this stuff - my family has got so used to the impossible just taking a little longer than usual that they look bored when I share.
    I really...
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    With the pinon pressed into the soft collet next...

    With the pinon pressed into the soft collet next thing is to bore it out.
    Very small, light cuts needed, as the grip on the pinon is not very secure.

    After boring to correct the concentricity and...
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    A long stick of pinion is not much use, so I...

    A long stick of pinion is not much use, so I parted three pinon shaped pieces off it.

    https://i.postimg.cc/GhBVQZpC/IMG-6830.jpg

    Then I could try a rough positioning of the the train. It all...
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    Been busy laying a hedgerow, so this took a break...

    Been busy laying a hedgerow, so this took a break for a bit, but now thatís done itís time to get on with it.

    I managed to mis-index the pinions whilst trying at few extra things, and as a result...
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    Fine silver is around 960C, alloys are lower....

    Fine silver is around 960C, alloys are lower.
    Silver solders melt between about 500C and 800C

    Dave
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    Let me make one train first, then maybe I should...

    Let me make one train first, then maybe I should make another and do the research directly...
    Of course that would mean buying the cutters which the whole point was to avoid....

    I'm not sure...
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    Nice. DMLS or binder fired? What metal? ...

    Nice.
    DMLS or binder fired?

    What metal?

    Dave
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    I have Wilds Wheel and Pinion cutting, though...

    I have Wilds Wheel and Pinion cutting, though itís a few years since I read it. Iíll have another look, but IIRC it just makes a statement to the effect of gear trains for clocks are cycloidal, but...
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    Do you have a source for that statement? Dave

    Do you have a source for that statement?
    Dave
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    There are a few reasons, but mostly it boils down...

    There are a few reasons, but mostly it boils down to being bloody minded and wanting to try something that is not normal ;)
    Whilst traditionally the cycloid tooth form is used I have failed to...
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    Following a lot of reading about aspects of gear...

    Following a lot of reading about aspects of gear manufacture I've started on the Pinions.

    When I get to Watch sized parts I think I might want to make a slightly smaller setup for cutting.
    (Anvil...
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