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mbhorology

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About mbhorology

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  1. mbhorology

    Lathe motor size

    A picture is indeed worth 1000 words; yes this helps. Thanks again.
  2. mbhorology

    Lathe motor size

    Thanks that helps. I've looked at Unimat 3 motors and they are rated at about 100 Watts. I was looking at the spec of a 4pole 3phase motor of a similar rating and with a speed controller I'd be able to get between 130 and 2000 rpm. Does that feel correct? The alternative is a 2pole motor but the speed range would be between 300 and 4000 rpm which feels too fast.
  3. I have recently acquired a Lorch LL instrument maker's lathe for which I need to source a motor. I am planning on using a 3 Phase motor so that I can use a VFD inverter and hence be able to control the motor speed. https://drive.google.com/file/d/1yoLJcPEZeQh8ueS-70Qw4jPmdtadtdf4EA/view?usp=sharing My question is, what size of motor do people typically use on these small lathes? It is a little bigger than a watch makers lathe with 65mm centre height. It uses 10mm collets. The lathe will be used in a clock repair workshop. Thanks
  4. mbhorology

    soft solder for repairing recoil escapement

    Well I just wanted to feed back on this now I've changed my flux and solder. I have obtained some "Bakers Fluid No 3" and 60/40 tin/lead solder. I found that applying flux, holding together, then applying solder wasn't successful like you might do with silver soldering. I did however find that tinning both surfaces first (having cleaned as suggested above) and then soldering together resulted in a good joint that when cleaned up didn't show any join.
  5. mbhorology

    soft solder for repairing recoil escapement

    Thanks all for the replies (with small misunderstanding in the middle). I think my lead free solder isn't helping matters here so I'll go lead/tin solder and the flux suggested above. I'll see what my local ironmonger has in stock.
  6. mbhorology

    soft solder for repairing recoil escapement

    Michael, thanks for the reply. I've had a quick look around and wondered if Bakers Fluid is the thing I need: https://www.rapidonline.com/bakers-no-3-soldering-fluid-125ml-84-2351
  7. What is the correct solder and flux to use for refacing a recoil escapement with an offcut of mainspring? As an experiment I've tried soft soldering using plumbers Plowerflow and lead-free solder with brass and that is fine, however the results on steel are hopeless; the solder just doesn't flow. I believe you are supposed to use a tin/lead solder, but I'm not sure on what flux you should use.
  8. mbhorology

    Watchmakers lathe collets

    Interesting and good info. Do you happen to know if they were referring to the collets which come with their lathe package https://www.ebay.com/itm/New-Unused-Mini-Precision-Watchmaker-Lathe/282991424601?hash=item41e39a7459:g:9WAAAOSwM0FXIAbV or did they refer to these which are available separately https://www.ebay.com/itm/77-Pieces-Collets-for-8MM-for-Watchmakers-Lathe/401089759992?hash=item5d62d00af8:g:-ggAAOSwZ8ZW6fio Thanks
  9. mbhorology

    Watchmakers lathe collets

    Just wondering if you made any progress on this? I'm also considering the Chinese collets from Sincere Tools on eBay, so would be interested if anyone has experience of these?
  10. mbhorology

    Ultrasonic Cleaners

    Thanks for all the replies. Some good advice about cleaning antique brass here which I'm well aware about and the use of amonioniated cleaning solutions. Conservation is always a hot topic but for 20th century brass made of rolled brass the brutal cleaning methods are fine. Back to the ultrasonic cleaners it feels like these Chinese units are good for occasional use and only for short periods of time which probably suits my initial use anyway. If you happen to burn out the ultrasonic element can you get a replacement or is the unit a throwaway item which parts are not available. My other option is to purchase a higher quality unit. Can anyone suggest a fairly priced unit? Elma is an option I can see but they do cost 7 times the price of the Chinese unit!
  11. mbhorology

    Ultrasonic Cleaners

    At some point I'd like to add an untradonic cleaning machine to my workshop. I work on clocks and watches so I'd probably aim for a larger machine. There are lots of eBay sellers selling machines like this: https://www.ebay.co.uk/itm/302691315924 They are so cheap I'd almost consider a small one for watch components and a bugger one for clock parts. Question is, are they any good or am I better going for a more expensive machine? Thanks
  12. mbhorology

    Choosing a replacement mainspring

    Thanks for confirming this. I'll purchase a new spring very shortly.
  13. mbhorology

    Choosing a replacement mainspring

    Thanks for the replies, I've added a couple of pictures. This is the hook: And this is the barrel (yet to be cleaned) The centre of the spring is a standard eye which goes onto a sailed arbor. Does the GR6413 have these bookings? Thanks Mark
  14. I'm new to this forum and fairly new to watch repairing (following BHI distance learning course) so I hope this question is in the correct place. I'm wanting to replace a broken mainspring in a pocket watch and have identified the GR6413 as the correct size spring. This has a "normal bridle", but I'm not familiar with this term. Can anyone advise me of the hookings for this spring? Is "Normal Bridle" the term that GR use for a resilient hook? Does centre of the spring have a eye cut for a snailed arbor?
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