Model Train Talk South Africa
Model Train Talk Workshop => Beginner Q & A => Topic started by: Georgecape on June 21, 2017, 07:16:36 PM
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Hi,
anybody that can point me in the right direction pse.
I need 2 tiny screws for the gears on a Lima O scale pancake motor (I think that's what it's called).
As per sketch in Powerpoint attached?
Thks
George
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Hi George,
are you sure its M1.8?
I've heard of M1.5.
I do have some M2 bolts, but not with a shoulder.
Although some Märklin bolts might fit, they would be M2 though.
Regards Jörg.
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J,
that's what the Vernier reads. I've now tried a few bolt & nut shops in Mont Gdns but the counter staff don't know anymore who does machining of such small screws. Those were the days when the old gentleman behind the counters could tell you exactly what their clients did and who worked with small screws or Allen caps or did fine machining etc.
I'am thinking of putting a sleeve of copper pipe (3mm dia) over the shank and then turning it down to 2.5 with some sandpaper.
There's a watch parts co in Cape Town but I do anything to avoid going into town ;). In the end I'll just have to.
The thread can be 2mm but the important part is the 2.5 x 3.5mm shank - that is the axle the gear turns on. I stick the back end of a 2.5mm drill bit through the gear and it runs like a sewing machine.
I'll certainly keep my eyes out for parts at the forthcoming show :)
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Best place for bolts and screws is Top Fast in Paarden Eiland.
I do have a small lathe, but its not very accurate. :-[
Maybe post some photo's of all the parts and we'll come up with a solution.
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J,
I tried them but it's just too tiny even for them.
It's the little bolt/screw in front.
I tried the 3mm copper pipe but it's just too flimsy/dicey for me. The OD is 3mm and I drilled a 2mm ID and then I chickened out.
I'll visit the hobby shop in Som West and/or try one of the machining shops in the Strand on Monday.
Everything else is in such good condition and now that I've found replacement DC motors from Mantech I just have to get 2 bolts made up. I suppose it's a matter of finding the right machinist :).
A hobby machinist would be 1st prize :).
Thks for your offer but I think at 2.5mm dia one needs extreme accuracy and a very delicate touch.
Any other advice?
George
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Ps I see the example behind the bolt is the 2nd unit with the bolt still intact.
You can now see where it fits.
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Took a drive through Stikland Industria and at the 2nd machine shop I struck gold. The machinist grew up with Marklin (still in the original boxes in his cupboard), gave the screw one look and said no problem as long as his dad has a die for the thread - and he was ever so positive about dad's box of old tools.
So I'am holding thumbs this week for some good news :)
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Ok all good news. He turned 2 axles and I managed to fit one drive assembly with the new motor and it's running well by RC.
So I need to finish some track this weekend and I can make up at least one route consisting of 4 90deg bends and a full circle. From bedroom down passage to turn underneath dining table, across carpet and turn 90deg in front of TV and back to full circle in bedroom. Wow grandson will be pleased :D
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Great to know that you got sorted. :thumb:
Are you going to share with us who helped you?
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The axles were done by Martin at Metaltech, Stikland and the re-threading of the body and drilling of the new brass gears was done by MO jewellers in Strand street, Cape Town.
That craftsman has got between 50 and 100 wooden tool boxes filled with tools and/or instruments. Not many with those capabilities left in SA.
The one with tiny DVD type DC brushed motor from Mantech runs beautifully but alas the other one sticks once every turn - I cannot for the life of me see anything wrong with any of the 4 gears.
Will try to get some advice from Graham in Plumstead tomorrow.
I see Mantech sell plastic gears in a set and that may be my next stop but what are the chances it'll be compatible?