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  1. M

    Mystery travelling steady

    hi folks A friend of mine has been dealing with her late Dad's estate; he was a wild hoarder of engineering paraphernalia, and she's been doing a really good job (with some help :)) of identifying things and finding new homes - keeping as much out of the skip as possible. And there has been a...
  2. M

    8 pole 1/4 hp single phase induction motor - capacitor sizing

    Hi folks Inspired by our friend on the 'bench grinders' thread, I have been digging into a pile of induction motors I was given to sort out and sell for a charity I support. There are a couple of nice old Brook Gryphon jobs, all the way from Huddersfield, which are 1/4hp 8 pole 710-ish rpm...
  3. M

    Compound gear train estimates from decimal target

    hi Folks I have been thinking about compound gear trains, and trying to get close to a decimal target value (eg, 1:1.2104114 etc etc). I used to know enough to program this into something like Matlab and rank order the estimates based on error magnitude...but that was in a former life when I...
  4. M

    BS-2 Dividing Head - drive ratio from change-gear shaft?

    hi folks I am doing OK (I think!) in slowly getting my head around the maths of the relationship between bed travel, workpiece rotation, gear OD and desired helix angle when cutting helical gears. These will be full-size gears. I know there are several very neat methods for making model ones...
  5. M

    Tim Hunkin - secret life of machines - new youtube programmes

    Hi Folks Somehow I missed the 'Secret Life of Machines' programmes 30 years ago - I think they broadcast at a time I had no telly. So I only just discovered Tim Hunkin, just in time for a bunch of new videos on making things, on youtube. If you like engineering (probable, since you're here)...
  6. M

    Splicing linisher belts?

    Hi folks I was given some belts in various grit sizes which would be handy on my linisher - except they are about twice as long as I need. I wonder if anyone has found a way to join lengths into loops - some of those I have (in the correct lengths) appear to be joined with something like...
  7. M

    Boxford / South Bend / 9" lathe : metric screw cutting on 8tpi leadscrew : 80/63 approximation

    Hi folks I like tool modifications, for the sake of it really. My Boxford (South Bend 9" clone for US readers) uses a 127/100 compound gear to cut metric threads on an 8tpi leadscrew. Original ones of these come up on ebay fairly regularly, but can get quite expensive if a couple of people...
  8. M

    Small lathe, big chuck

    Hi folks This 8" chuck came my way, and I stuck it on my small lathe. I've been finding myself doing a lot of foreigners in work due to being able to hold stuff in a big chuck - and to some extent I can now stop presuming on my bosses understanding nature and bring some of that stuff home...
  9. M

    Kearns S-type small (!) horizontal borer

    Hi folks An antique engine museum where I do some volunteering has just acquired one of these machines. Here's some pictures of someone else's: https://insta-stalker.com/post/BtTiw_hgxg0/ I know this is a bit big for a model engineering forum, but I thought someone might be able to point me...
  10. M

    Bridgeport x-feed - dog clutch?

    Hi folks The Bridgeport vertical mill I get to do some of my foreigners on has a problem with the RH longitudinal feed handle. One gives it a small twist to make it engage - sometimes it does, mostly it doesn't, and if the gib is at all tight it definitely doesn't. The one at the LH end of...
  11. M

    Making a circlip

    Not sure where to put this on the forum - hope here is OK. I have a very odd job where (for reasons of access and disassembly) I think I need to make a circlip. It will locate a 52mm OD bearing axially, and a 10-tooth 50mm OD pinion has to pass through it on assembly and disassembly. I think...
  12. M

    Drill / mill dead centre on a horizontal bar?

    Hi all I need to mill some splines in a bar, which means hitting it dead centre - slot drill coming down vertically, bar horizontal underneath. I have a cheap digi-vernier set up as a DRO, so I suppose I can use the Rizla method, work out where both sizes of the bar are with a plain mandrel of...
  13. M

    Cheap (Chinese?) Carbide Tips

    Hi folks I recently bought a cheap (£35-ish) R8 4-insert 50mm face cutter, and I've been playing with it on the Bridgeport at work. I bought a cheap one as I reckon I've more chance of smashing up the tips by doing something daft, than wearing them out doing appropriate things lots of times at...
  14. M

    Making brass

    Hi folks At the weekend I made some brass, with my foundry mate. The good bit was realising that since UK law has changed on using lead for wheel-balancing weights, most of them are made of zinc. I have been collecting ones found in the road as I cycle to and from work for some time, and my...
  15. M

    Learning to braze

    Hi folks I'd like to make some progress on a 3 1/2" gauge 0-6-0 someone gave me a good while ago - it's what brought me here. I built a furnace and taught myself to cast bronze; I made a 'milling machine'; next missing skill is brazing. I have a little silver solder, but it's so expensive -...
  16. M

    Gudgeon (wrist) pin pads

    Hi folks I have a piston in a full-size engine which has chewed up one of its circlip grooves. Luckily I got it out before the clip escaped and scored the barrel. I think the end load occurred as the pin part-seized in the small end, and cracks were developing in it (pictured - crack...
  17. M

    Which tapping head?

    Hi folks. I hope the mods will indulge me - unlike some people on here who made things in their shed following a career as a machinist, I found a (very part-time) career as a machinist having first made things in my shed! As a result my knowledge of some types of industrial tool is a bit...
  18. M

    Clutch?

    Hi folks I'm adding a motor with a worm-reduction box onto the x-axis of my home-made miller. I was going to do it with a long and improbable belt drive, so as to be able to slacken the belt and use the hand-wheel. But a direct-drive would be neater, and easy with the motor I have fallen...
  19. M

    Ask a stupid question (vertical slide adaptations)

    Hi folks I have the remains of a vertical slide which had been made to fit my previous lathe (a really unusual thing called a 'Wandess' - see lathes.co.uk if you are interested in oddities) and which went on instead of the top slide and was always vertical with its face perpendicular to the...
  20. M

    Making a dividing plate

    hi all Flushed with success at getting my home-brew milling machine to work, I fancy having a go at gear cutting. I've read up on an approximate method using a home-made hob by 'Helichron', referenced from this forum - very interesting and nicely explained. I have a long-term loan of a...
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