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Member postings for Bazyle

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

Thread: Myford ML10 change Wheel question
19/08/2018 01:48:36

I was referring to my table that shows two rows attributed to Drummond in that they published the combinations at some time in the documentation for their lathes. Suggesting the lower of those However I now see it does not convert to starting with 25.
That fixed first gear is a nuisance. One of the advantages of a tumbler reverse is that it usually end up with a new stating point of an axle running 1:1 ratio with the main spindle that can take an alternative gear to start the chain.

18/08/2018 23:24:00

Since you mention other combinations here are a list of approximations used to get 1mm pitch from a number of sources. Arranged in order of accuracy. Obviously you don't use an 11 & 13 tooth gear and multiply them up to what you have eg 22/26 and the 1s are just there because the spreadsheet is set up for 6 gears while sometimes 4 is enough.

I think it is interesting that the early Myford conversions using the awkward non standard gears 73/46 is only twice as good as the earlier Drummond approximation using regular gears from the imperial set. This means you probably have the gears to use the bottom Drummond version without the 63 and not having to get another 50.

driver driven driver driven driver driven mm
Pitch
Error  
13 19 4 7 29 36 1 2.08855E-05 colchester
1 19 64 11 36 35 1 2.73411E-05 Harrison
25 63 25 35 50 45 1 6.29882E-05 baz
25 63 25 63 40 20 1 6.29882E-05 baz
35 60 45 50 30 50 1 0.000125 baz
63 60 30 100 1 1 1 0.000125 drummond
37 47 20 50 1 1 1 0.000212766 logan
46 40 20 73 1 1 1 0.000342466 myford
65 30 20 50 20 55 1 0.000606061 drummond
13 11 30 56 20 40 1 0.005073052 raglan

Edited By Bazyle on 18/08/2018 23:32:52

18/08/2018 21:43:12

2mm is quite an easy one 25, 100, 63, 25 if you have the gears. Gets a bit annoying if you haven't got the right ones. Note that the 63 is always a driver for the metric conversion so is always in that position.

18/08/2018 21:28:08

The power is coming from the spindle so the gear on it must be a driver.

You can also work backwards knowing the very last gear which is on the leadscrew has to be a driven one.

Thread: Record No 1 vice pin sizes
18/08/2018 17:46:30

I would not use a hide or rubber hammer as the probably small head of the punch might leave a dent in it. I would only use a lead/copper/aluminium hammer if the hitting was light for the same reason. I can't really think of a reason not to use a steel hammer when the pin punch is in between to protect the job but would be interested to hear a reason.

Thread: Is Model Engineering in Decline
17/08/2018 11:15:40
Posted by Limpet on 17/08/2018 06:23:40:

The problem we get in the south West is that there are no local shops the nearest one I could get anything for the lathe or mill is over 30 miles away ( hardly a quick nip out)

Actually it is the same everywhere, even outskirts of London unless you happen to live near one of the few there are. But there is a huge regional disparity in everything and further town/country restrictions whether your interest is engineering of chicken racing. Where there is deep penetration, eg football, swimming, music there is still a big variation in facilities provided. Some people get lucky and have a job, family and hobby well catered fro in just one town but most don't.

AME going out of shops.
In the UK ME is only in the newsagents in larger towns anyway, ditto most niche magazines and it has always been so. During school holidays I only got a magazine (eg Practical Electronics) if our once a month trip to the city coincided with a new issue and a fortnightly publication (ME) if I had known about it wouldn't be certain of availability.

Thread: Chucking a Small Octagon (Delicately and Accurately!)
16/08/2018 17:30:13

Another option is a wood turning chuck that has removable sub-jaws for holding different sizes of bowl. These jaws are screwed on to the movable base jaws equivalent to soft jaws on a metal lathe. Make your own wood or plastic jaws to fit gluing on felt faces if appropriate.

Thread: Thread dial Indicator for Sieg SC8
16/08/2018 17:19:24

Bjorn the gear on a DTI does not transmit power and does not do anything precise. Therefore you can cut one from thin sheet brass and file the teeth and it will work ok. Using a thin gear means you don't have to worry about curves or angles for the teeth or mounting - very simple. A bit of plastic cut with scissors will work mounted on a drawing pin in a bit of wood.

Thread: Are Model Engineering Exhibitions The Same
16/08/2018 12:58:33

Really since the internet boomed show discounts have become rare.
I have done a lot of club stand duty and we do try to be friendly and helpful to the visitors but I expect for some of the 70+ age group a long day may reduce their amenability at the end.
Most people don't want to talk just look and are a bit put off by anyone from the stand trying to engage in conversation. However a few do really benefit from the chance to talk to someone especially if they are a long way from a club or are a missing the opportunity to join one. Many people are looking for some advice on a wide range of topics but of course not all the stand personnel can be experts on everything so it might pay to come back later and see if someone else is available.

Thread: 5 inch peak
16/08/2018 12:43:23

You do know there are 'program yourself' ones. Then just stand in front of your favourite train recording it.

Thread: Lathe bearing oiler wicks/felt
16/08/2018 12:40:22

I get my felt from a specialist shop selling cloth and sundries.

It even has a specialist name - haberdashers.

If you have an old real wool jumper that is beyond even charity shop use just throw it in the wash, every week for a few months and you get free felt. face 4

Thread: Which is better?
14/08/2018 18:29:02
Posted by Neil Wyatt on 14/08/2018 17:05:11:

If you don't buy the mags, they'll disappear...

Stage one should be contraction or amalgamation of the multiple magazines to what ME was. I'm not sure I will be able to afford two mags when I retire.

It is worth bearing in mind that there are English language modelling equivalents in USA and Australia plus other language ones elsewhere. Sadly rather than import these mags the publishing houses started their own new ones.

Hint to Neil. how about instead of reprinting old ME articles find ones from Australia. There must have been a construction series on the Puffing Billy line locos and a model built to AU specs would then pass their boiler requirements so we can all emigrate to get the summer weather we have become used to.

14/08/2018 14:08:10
Posted by Fowlers Fury on 13/08/2018 22:00:02:


Personally, I beleive the rot set in when it was decided to split Model Engineer into two - M.E. and M.E.W.

Don't forget that ME used to cover boating as well until Model Boats magazine took the market. From the seventies as computer based editing and printing made it all cheaper, along with better photo printing there was an explosion of magazines for every hobby or interest. My sister was an editor for a publishing house and started a few titles by being given budget for two issues and an advertising salesman. If the salesman could sell enough advertising it survived, otherwise it folded and on to try another idea.
Since the internet became cheap and portable the magazine era is dying. Like high street shops they must consolidate themselves, get bought by an asset stripper or linger on and risk crashing out like BHS.

Thread: Are Model Engineering Exhibitions The Same
14/08/2018 13:06:19

There seems to be a common complaint of rucksacks but over maybe a hundred shows I haven't noticed it as a big problem. Only a very few people have them at ME shows and mostly nowadays the aisles are wider. What does still happen at several shows is that there are one or two points, a door typically or a particularly popular stand where there is a problem. Model railway shows are often in schools so the doorway & narrow corridor effect is more likely than in an exhibition hall. The St Albans show coming up on the last weekend of September is in a school but if you find it crowded you can always escape to the outside live steam area.

Nor is it just shows but the world of public walkways. Loads of people dawdle in narrow passages or stop in doorways to talk to some one on the phone. There also people I call 'widewalkers' who plod down the middle of a pavement with a bag or two taking up the entire path that should accommodate six abreast.

A particular attraction for these people is the canteen. They queue for five minutes then only when they get to be the next to be served start to think about what they might have, look at the options for a minute and choose, then pick up the spoon for serving themselves vegetables and freeze. Now a conversation with the idiot accompanying them becomes the only thing on their mind. Well it's lunch time - I have to join a queue. Ill be back in an hour if lucky.

Thread: Class 22 Diesel (next project)
13/08/2018 21:59:31

Are you really going to use the loco that severely. The batteries in our club Compass House 08 shunter are just car batteries I think and are years old. When I was looking after it we used it for an hour or so until there were too many steam locos on the track and the batteries always recharged in an hour or less on a Halfords automatic charger. I never did a scientific assessment of the amount of discharge but the feeling was it hardly used any juice. The track is flat and we weren't pulling silly amounts of passengers.

Thread: Which is better?
13/08/2018 21:35:09
Posted by RevStew on 13/08/2018 20:05:42:

BTW I don't even think of 3D printing as model engineering any more than I think of printing an A4 copy of a Canaletto as art.

Now that is an interesting observation which I have yet to make my mind up about.

Anyway I think you are unlikely to get a magazine a the low level you desire because it would not nowadays be viable. There is ten times the number of beginners articles, videos etc than you could ever want on the internet now. It is the goto place for most things. A beginners magazine would lose its reader after a year as they became more experienced so would have to get a continuous flow of new readers. At any one time in any activity if there are 1000 beginners then there will be ten to fifty times as many more experienced. I know which market I would aim for.

I did enjoy reading back issues of ME from the '45-75 period and learned most of my model engineering from it. My school had nothing manual/technical and my science degree had one afternoon where we were shown a lathe from a safe distance then allowed to cast an ashtray (I have never smoked but still have the ashtray)

Thread: Comparing lathes now, with lathes then.
13/08/2018 20:59:23
Posted by Bob Stevenson on 13/08/2018 17:59:59:

robust carriage well equipped with 'T' channels

Note he said carriage not cross slide. I think that did not apply to hobby lathes like Drummond, Myford, generally sub 5in centre height. It was the small industrial lathes but >5in used in garages and small pro workshops that had that facility.

Thread: Riveting
13/08/2018 17:25:51

Assuming readers know what a rivet snap is and that you need one on each side in this case. The one linked has two 'holes' because one is for setting the rivet first.

Once you have found the length required as Jason says abovethere are lots of designs in old MEs and online for ways to cut them all to the right length.

Edited By Bazyle on 13/08/2018 17:27:54

Thread: Lathe tool angles
13/08/2018 17:16:31

The angles aren't that important but 5 is a bit low for steel. This is because it won't give much clearance so the first bit of wear will result in it rubbing. Use 10 all round for steel.

It is the top rake that really governs the cutting action and the other sides are just to give clearance and make it easier to get into corners. So 10-15 will give you a sharpish chisel edge for steel but higher values makes it weaker. For aluminium up to 20 helps and it is soft so strength is not an issue.
But for brass it cuts so easily that the chisel grabs the tool and causes a dig in. So you want and really need less than for steel, like 0 to 5.

Note and think about how moving the tool off dead centre affects the effective angles, especially for small diameters.

Thread: Peace Flame
13/08/2018 16:56:14

You're using an M8 adjusting screw! I wouldn't use that to regulate the Niagra falls. (model)

You want to look at the throttles for a model aeroplane engine which use a fine needle and a fine thread.

Get yourself two fine sewing needles one the smallest you can and the next a bit bigger, but not darning needle size. Make the small one into a small drill by grinding off the end and then grinding it into an elongated chisel shape.
Drill your brass valve seat almost through with the smallest drill you can find and not break. Then finish off the last 20 thou (half mm) with the needle.
Thread the body something like M2.5 or 6BA and drill a screw so that you can fit your larger needle in it.
The gas is of course going though the hole not across it as you have in your prototype and the needle is downstream so thread sealing is less of an issue.

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