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Project Logs / Re: my way to billd a stuart 10 horizontal engine
« Last post by krv3000 on July 18, 2018, 06:15:31 PM »
hi all not a lot of pics I direst up the box casting I filled in sum deep casting marks sos no pics of that bit then gave it a cot of black gloss pant do you no wat the silver thing is for made a rod to go in to the top casting for setting up on the angel bracket that I made to hold it still undecided in witch way im going to  mashen it right pics
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by WeldingRod on July 18, 2018, 06:14:41 PM »
I don't know, sorry.

Sent from my SAMSUNG-SM-G891A using Tapatalk

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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 July 18, 2018, 05:51:13 PM »
You have to remember that this machine has sat un-powered and unused in two locations over the past 10 years. Things deteriorate, connections corrode and problems are bound to emerge as it is brought back into commission.

It's not untypical that one fixes something only to find another issue emerge. Hopefully as I progress and a few hours are put on the clock (which isn't working by the way !!!!) the reliability will increase.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by charadam on July 18, 2018, 05:13:56 PM »
Andrew, I'm curious.

Is this normal for machines of this vintage?

I mean, apprentices in a cold shed throwing components from 5 yards and installing them where they fall?

Or is the component layout and circuitry designed with no concept of maintenance or fault finding.
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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 July 18, 2018, 04:09:31 PM »
Well an extremely frustrating day today  :bang:

I managed, by re-wiring hydraulic solenoids, to unlock the turret, allowing me to turn it manually and set it in the correct position, thus being able to initialise it - hooray. I could then select tools at will, jog where I wanted, and spin the spindle at great speeds forward and reverse.

However, once turned off and back on I couldn't even jog, the control reporting a fault with the KTK Mentor. Now I've been through EVERY wire into and out of the Mentor, documented them and inspected any that might report a fault. None do, and the drive says it's ready on it's front panel.

BUT - if the power to the Mentor is dropped and remade by dropping out it's isolator the fault very occasionally clears :scratch:

Once this fault is cleared I can jog as I wish. So two issues to bottom, the Mentor issue and the Turret issue - I did at least manage to winkle circuit diagrams for the Turret SMCC servo card out of Delta Tau in California today  :thumbup:

I think tomorrow I will log  the voltages on all 41 of the Mentors interface connections with the fault 'ON' and try to clear it and repeat the logging - hopefully that will show how the controller knows that there is a fault  :scratch:

. . . meanwhile I'm going to finish off this bottle of Pinot, I'm sure things will look better after that  :clap:
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Project Logs / Re: Building a New Lathe
« Last post by PekkaNF on July 18, 2018, 12:09:33 PM »
Pekka, you might recall I did a similar Tee-slot table before, though that time I just added the tops of the Tees:

https://madmodder.net/index.php/topic,8900.0.html

Thank you, I remember that one, but it was good to read again.

Pekka
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Project Logs / Re: Building a New Lathe
« Last post by vtsteam on July 18, 2018, 10:46:52 AM »
Pekka, you might recall I did a similar Tee-slot table before, though that time I just added the tops of the Tees:

https://madmodder.net/index.php/topic,8900.0.html
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Project Logs / Re: Building a New Lathe
« Last post by vtsteam on July 18, 2018, 10:41:51 AM »
Sorry Andrew.

Pekka the holes in the cross slide and the T-bars were all done on the mill. Admission: unfortunately the first time I drilled the cross slide I hadn't checked the mill vise from the last time I'd used it, and it was slightly off perpendicular.  :palm: :wack:

But, since I decided that 1-3/8" spacing between rows was smarter than 1-1/2" (because I could use 1" wide bars instead of 1-1/8), I plugged the old holes, indicated the vise in accurately, and re-drilled everything with the altered spacing. Because of the change in spacing, none of the newer accurate holes impinged on the old holes. so it was all in new material. Then I tapped them. So to answer your question, the T-slots should all be accurately parallel with the bed ways.  :med:
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How do I?? / Re: Reversing D.C. Motor Direction
« Last post by Pete. on July 18, 2018, 09:08:37 AM »
No it's shunt wound.
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How do I?? / Re: Reversing D.C. Motor Direction
« Last post by John Rudd on July 18, 2018, 04:07:42 AM »
I dont comoletely understand what you have there, given your description.....

A dc motor has magnets, no wound field coils....it will run on a dc supply only

A universal motor doesnt have magnets, but wound field coils....will run on either ac or dc supply

Any how, in either case, swapping over the wires to the brushes will change the direction of rotation....

Do be careful..... :zap:

My lathe has a DC-only motor with field windings.

Ok, a generalisation, there's always an exception like a car's starter motor

In your case ..presumably the field windings are in series then with the armature? That is the same configuration as a universal motor that can run on ac.....
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