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Tools / Re: How true/straight slitting saws run?
« Last post by PekkaNF on Today at 08:27:31 AM »
Bit related vid...
=1324

Tried to make it start at 22 mins ...right at the interesting stuff, but parser seems to vomit timeline....worth watching at the beginning. :D
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Model Engineering / Re: How to cut a 1/2 round slot.
« Last post by Arnak on December 12, 2018, 08:09:44 PM »
Hi Guys,

Thanks for the advice. :D

The 6mm groove is no problem as that can be drilled first after the rod has been re-rounded after being cut in half then joined back together.

Then I will need the cutter...

I will try the 16mm silver steel and make a cutter as suggested.

I can then use it in the mill with a collet chuck. :headbang:

Martin
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on December 12, 2018, 05:22:42 PM »
The plan is to let it wear itself in. It has room to settle in a bit, but really it's just a case of watching and waiting as it is used.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by nrml on December 12, 2018, 05:08:54 PM »
Is the crown end going to be cleaned up or will it wear into place?
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on December 12, 2018, 04:50:08 PM »
Were I doing it again I would beef up the shank, leaving more meat  by the keyway, but also make the PLA model's bore far smaller leaving more the bore out on the lathe. Both bronzes only just cleaned up, at 14.05 mm, leaving slight 'witness marks' in place - perfectly serviceable but ideal.

. . . but I do have not only a bronze second one as a spare, but several ABS and PLA ones that actually seem to work OK !
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by PekkaNF on December 12, 2018, 04:40:42 PM »
I thought the same Pekka, but we are not talking huge torque, just light milling.

Between a visit to  the dentist and a friends birthday lunch I managed to fit one of the bronze drive dogs - went in as a nice snug fit  :thumbup:

Sweet!
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Project Logs / Re: Building Wildings Tower Clock
« Last post by smiffy on December 12, 2018, 04:29:47 PM »
I doubt if using either size would make much difference .By there very essence lantern pinons are more forgiving to a fairly wide tolerance range than a conventional gear.   
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Model Engineering / Re: How to cut a 1/2 round slot.
« Last post by Jo on December 12, 2018, 04:13:05 PM »
Ali is easy to cut: Find yourself a piece of 16mm dia Silver steel machine it to provide a 16mm diameter 6mm thick end with a 5.5mm ish shaft (Leave the rest of the shaft a size to hold in a collet chuck). Give it a centre drill hole and then mill yourself some, say 8, teeth round the cutter surface using support in the centre hole. File to give them a bit of relief (look at your other milling cutter edges to see what I mean  :thumbup: )

Harden in the normal manner...

Cut the 3mm (6mm diameter) half groove using the side of an end mill. When you use the cutter lubricate it to stop the chips sticking, cut on a slow speed, don't go in too fast and remember to clear the chips.

Jo

P.S. Make sure you get your teeth the right way round on the cutter.
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Project Logs / Re: Building Wildings Tower Clock
« Last post by raynerd on December 12, 2018, 04:01:18 PM »
Sorry sorry... I can get 1.3 or 1.5mm not 1.4!! You are obsolutrly correct,  54 gauge is 1.397mm
Iíve been to Ian Cobb who can source everything and he canít get 1.4mm...

So question back again. 1.3 or 1.5mm? I appreciate your mention about above the addendum being critical and I agree but isnít this a worry as that suggests the diameter is the critical bit?
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