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Member postings for Avon

Here is a list of all the postings Avon has made in our forums. Click on a thread name to jump to the thread.

Thread: Imperial Fasteners
30/12/2019 16:50:57

With regard to the GroupsIO site. I created it when the Yahoo Group was about to expire. I've copied all the old files and photos to it so at least they're still available. There hasn't been much traffic as there are only 5 members. I'm obviously happy to accept new members or to migrate the data to a more appropriate website. Alternatively, it could be expanded to accommodate all S&B owners, but in order to host all the photos that would come at a cost - which is why I just limited it to Model M. That said I suspect many of the old photos don't need to be migrated. One option is to simply allow it to grow as users find useful.

Happy to consider suggestions?

28/12/2019 16:58:28

Just thought i'd share a couple of photos of my newly filed dog pin socket screw - it retains the gear for moving the saddle along the bed. Both the original and the replacement are shown. I heard a similar story to Howard's many years ago - if I remember correctly an expedition to the Duhd Kosi river in Nepal had a problem with a wheel stud - the local mechanic simply filed a replacement which apparently gave good service for the remainder of the exped.

photo 28-12-2019, 14 22 21.jpg

26/12/2019 20:04:41

I did try contacting Bracehand a while ago but didn't get a reply. If they are operating I would happily share the drawings I'm making of the Model M Mk1 on Onshape.

It would have been a wholesale job to convert the lathe to metric and it would have been a surprise (but not impossible) if it had remained metric. My thinking for this is that the S&M was based on a German Boley lathe which I expect was metric, but since this was shortly after WW2 I imagine the enthusiasm for things metric would have been limited.

For info, I've now cleaned the threads that were causing concern and ordered replacement screws - the sizes were 2BA and 4BA.

24/12/2019 21:56:30

Hi Duncan, I thought the Mk 1 was made until 1956, but I cant find where I got that from. Lathes.co.uk could be read to say that it was no longer produced after 1948, but that would assume the Mk1 and Mk2 weren't available together. I simply don't know, but if you have more info I'd be grateful to know. All the best.

24/12/2019 16:24:32

Gentlemen,

Many thanks for the advice - I'm not certain that the screw sizes are 2BA & 4BA. I've now cleaned the threads with the relevant taps and things are looking much better.

The help has been very much appreciated.

Hope you all get suitably useful Christmas presents!

All the best.

Peter

23/12/2019 16:32:52

Gentlemen,

Delighted to have started such an enthusiastic debate smiley!

I have now had a closer look at two screws in particular (thanks Hopper for making me look through other old stuff from my father - a magnifier was found!). The results are as follows:

Baseplate retaining screws: 32tpi with a measured major diameter of 0.1825". The thread gauge actually reads 32G5/32, but 5/32 is too small!

The countersunk screws appear to be 4BA, with what appears to be almost exactly 38tpi and 0.134" max dia.

It is worth remembering that most of these screws/holes are worn so measured sizes are unlikely to match the 'as designed' specs.

Does this help you to help me?

Regards

20/12/2019 19:41:19

thanks John - they look to be a useful source. I'll give them a call when I'm more convinced of the sizes I need.

20/12/2019 19:33:29

Martin, to my shame I do have a tpi thread gauge but the results seem inconclusive! i'm going to spend more time at the bench and carefully assess the tpi and my use of the guage (maybe the ones I have are a bit cheap!).

Bazyle, what a thought - I shall see if I can find any in the loft!!!

20/12/2019 18:57:40

Gentlemen, thank you all for the prompt responses, I have been Googling for Britain with only very limited success. I think I'm going to have to very carefully measure the screws (there is more than one type) and post that info - cant do it at the moment as away from home.

Also, I want to get exactly the right threads as a number need holes retapped as they've not been loved and for some the thread has almost been obliterated - I'm hoping I can identify the thread from the relevant screw and work from there.

I'll have a look at the companies suggested and see what I can achieve.

Have a great Christmas.

20/12/2019 17:25:01

Hi, I'd be grateful for some advice on where to source imperial sized countersunk and socket head screws to replace some rather worn ones on my v old Smart & Brown Model M Mk 1. If I could confidently state what size they are I know that would help, but that too is proving difficult. The smallest is about 5/32 and probably 32 tpi.

Grateful for your thoughts.

Thread: Old Lathe Lubrication - oil through a grease nippled?
08/12/2019 17:05:30

Gents,

Many thanks for the comments. I'll follow them all up. 'Old Mart' - an interesting suggestion to use such a light oil, though I can imagine that it certainly gets to where you want it. I obtained a specialist oil for the head bearings which have felts to move it from the reservoirs, but am away from workshop so can't check the spec. I was going to use slideway oil on the leadscrew.

Many thanks all.

Thread: Unsolicited email from SOLIDWORKS
08/12/2019 16:55:16

Hi Raymond, The personal access is definitely free and allows unlimited numbers of models (a model includes all the parts, assemblies and drawings to make a complete set) so not sure about your '...or if at all..' comment. I checked on the onshape site and the CEO has stated that there is no change to existing pricing plans.

Hopefully my info is correct - I certainly hope so and that things don't change.

All the best.

Peter

Thread: Old Lathe Lubrication - oil through a grease nippled?
08/12/2019 14:50:54

Hi,

I have an old Smart & Brown Model M Mk which I'm renovating. I'm now stripping down the leader screw gearbox and find two bearings, which are hidden inside the, bed are lubricated via short pipes that lead to 'grease nipples' on the rear of the machine. The bearings are plain 'brass' bearings which I can't believe would be greased. This gives me two questions:

1. Where do I get a manual oil pump with a grease gun fitting? Or even a hand oil pump that does more than dribble the oil out?

2. What oil would you use?

Having taken the end plate of I find it carries a number of gears and wonder what to lubricate them with? The oil from the bearings wouldn't find its way to them and while there's a grease point on the back wall of the chamber there's no way that anything injected there would ever reach the gears unless the chamber should have an oil bath, but there's no site glass and doesn't look as if that's the way it was setup. Grateful for thoughts from all the experts.

Many thanks.

Peter

Thread: Smart and brown lathe
08/12/2019 14:36:52

I have a Model M Mk 1, which I'm about 50% through renovating. I'm also drawing it in Onshape as I go, the drawings are all public if you have an account (free). So far I've drawn the headstock and saddle.

Thread: Unsolicited email from SOLIDWORKS
08/12/2019 14:17:44

Just a thought but why not try Onshape. It's a fully functioned cloud based CAD system built by people who established Solidworks. You can use it for free provided you don't want your models to be private, which to my mind is ideal if your learning cad or just doing it for your own satisfaction.

I'm using it to draw a Smart & Brown Model M Mk1 which I'm renovating. It's a case of I've started so I'll finish.

It's just a thought but saves lots of discussion about costs etc

Thread: Onshape CAD
06/09/2015 18:14:40

I've been using Onshape for the last month or so. Just thought I'd correct a couple of things:

Onshape have changed what you can do for free (which is a huge pity). You get the 5GB of total storage, but to do so you have to create the document while you're under the 100Mb Private document limit, and you can have a total of 10 Private documents - I think you can have as many public documents as you like.

Elsewhere it was mentioned that you couldn't print from OS, but it is certainly possible in the version currently in use.

The drawing facility has arrived so that true 2D drawings can be produced from the 3D parts and assemblies.

The thing I like about this is the ability to animate the model, not automatically, but I'm happy dragging the little handles around to watch my Hot Air Engine do its thing - I've even been able to actually explain how it works to my better half!!

Hope this helps.

Thread: Did you make one of these at school or as an apprentice?
02/11/2014 22:12:36

Just thought, but perhaps it's the fastest machine for a given pressure. In truth I think there will be a range of 'best' builds since we're looking for the most efficient and that could vary for a range of pressures and loads. Would be an interesting experiment.!

05/09/2014 05:21:51

Hi Lofty, looks like a great model - the marble base is certainly an improvement on my original casting! I' ve sent a separate message with my e-mail address as I would much appreciate a copy if the plans.

many thanks.

04/09/2014 13:53:50

Hi, I know this is an old thread, but I've been searching for this model for ages. I made it for O level Metalwork including casting the base. However it was once in my parents house but has since disappeared. In October I getting a real Manshed built and will install my fathers old lathe and milling machine. I think remaking this project will be a great starter, maybe even casting the base (friend has a forge!). If anyone knows where I can get a copy of the Haynes book 2 I'd be grateful.

thanks

peter

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