Recent Posts

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21
Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 17, 2018, 01:18:17 PM »
I turned the gauge to 2.440" on one side and 2.430" on the other. Sorry I don't have any photos of turning, but if you're interested, John (Doubleboost) posted a fine video on youtube awhile back showing the process of bore gauge making (his ER32 lathe chuck video).

I'm adding an additional touch to suit my particular headstock boring setup here -- first drilling the gauge 3/4"

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Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 17, 2018, 01:12:47 PM »
Getting closer to journal size, it was time to make a bore gauge. I found a scrap piece of aluminum 2.5" in diameter. The bearing measured (on my calipers) 2.4395". Not that they are accurate to a half thou, but I've been using it consistently, so parts should match.

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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 June 17, 2018, 01:11:54 PM »
A little bit more progress today:

I wanted to prove the PSU was OK but only the +5 volt output had test points. I was fairly sure that it also was supposed to put out +15 v and -15 v.  Pulling the PSU apart it's only output connector is a three row  96 pin Eurocard type. I was surprised to find that mains for the 240 volt rack fans is routed via this connector. Inside I found a pair of 15 volt regulators confirming my suspicion, and also a Ferranti Uncommitted Logic Array - in a PSU for goodness sake WHY ?

Soldering a pair of 'wire wrap' square gold plated pins to my test probes I was able go along the crate back board and find the 15 volt lines powered up, so that's looking good.

Then I turned my attention to some of the card retaining screws that had sheared off. They are M4 but have an extended outer part with a hand grip, and a turned down section to retain them in the card. Drilling tapping and Loctiting replaced the sheered threads.

Then it was a case of 'hunt the battery' The one in the back of the monitor was easy - it's an SL2770 and RS Components carry it. However the one on the little RAM card proved more elusive. The original is in far too bad a shape to take reliable measurements from, but eventually I found an image on the web that revealed all - it's an SL886. There are two versions, one with pins and one with pads, and the original and the image I found don't help the diagnosis, so I will wait until the replacement card arrives to see which before I order.

Strangely the data sheet for the SL886 give it's weight as 21 grams, and my ruptured one weighs EXACTLY 21 grams despite all that death and destruction that it has oozed  :scratch:

Apart from posting pleas for help on Practical Machinist and CNC Zone that's about it for today.
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Tools / Re: Edgwick lathe
« Last post by Biggles on June 17, 2018, 12:54:30 PM »
Hi and welcome Faz, larger machines tend to be cheaper than Myfords at the low end. i expect Edgwick/Harrisons etc now days to be around the 1k mark if they are reasonable and with some chucks/tools etc. unless they from a dealer who will probably apply VAT. Having said that there is one dealer online forget his name, who doesn't have VAT.

George
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Gallery / Window / glass camera mount
« Last post by David Morrow on June 17, 2018, 12:37:21 PM »
A friend of mine lives in a high rise apartment and nearby, there is another tall building undergoing a slow motion demolition - about 2 years. He bought a camera that could be set for time lapse photos and mounted it to his window with a suction cup mount - same suction cup as many dash cam's. The problem was that the suction was only good for a few days, maybe a few weeks. Putting the camera back in the exact same spot and angle was almost impossible when the suction was lost. I suggested that we make a mount using rare earth magnets - half the magnets attached to the mount, and the other half on the other side of the glass. The window was single pane and that made the distance between the magnets much smaller. We made the mount to use 8 magnets on each side but found that 4 was the safe minimum and 6 magnets stuck like the proverbial to the blanket. He ended up using all 8 because he already bought them. To say that this mount was solid when mounted on the window is an understatement. The camera was attached to the window mount with a Ram arm and Ram ball.

This is the mount being tested on one of my kitchen cabinet doors.




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CNC / Re: DDCSV Support Forum
« Last post by 71taa on June 17, 2018, 11:31:04 AM »
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Project Logs / Re: Building a New Lathe
« Last post by vtsteam on June 16, 2018, 05:28:33 PM »
Done with the clearance hole. Now starting the bearing journals.

I believe these need to be 2.441" in old measurement. This is going a fair amount easier with only an inch to bore for depth. The arbor mount cutter is working very well. Glad the other is over with!  :Doh:





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Tools / Re: Edgwick lathe
« Last post by AdeV on June 16, 2018, 05:03:25 PM »
I just sent him a message and he still has it, will be re-listing it on Sunday 99p start no reserve.

* Makes mental note.

* Remembers I've got nowhere to put it.

* Reluctantly rubs out mental note...
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Composites & Plastics / Re: Glass fibre mould from the slender plug
« Last post by PekkaNF on June 16, 2018, 02:57:09 PM »
6 coats of release wax + layer of PVA release film

2 layers of 160  g/m2 twil and SP106 laminating epoxy. Hope it works, but it did not go around the corners that great. Hope it does not have exsessive amount of voids.

Pekka
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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 June 16, 2018, 01:13:20 PM »
So in that frustrating time 'waiting for bits to arrive' I've been poking around familiarising myself with the various cabinets of contactors, relays, and axis drives - it all looks fairly sensibly laid out and even without drawings it doesn't look too bad to find my way around.

I've investigated the possibility of 'Powered Tooling' being mounted in the tool turret, and sure enough the facility is there - the selected tool gets lined up and has a simple 8 segment dog clutch on the rear of the VDI40 mounting spigot, that engages with it's opposite number on the tool drive

Pulling the monitor apart it turns out that it is a colour one - or at least the drive signals entering it are marked as 'H V R G B' and researching the controller, one of the memory cards is only fitted when a colour monitor is fitted. Seller thought it was green phosphor only so this is a bonus. Not that I'm much closer to seeing anything on the screen !

As well as the mechanical Tool Probe, it looks as though at one time it has been equipped with an optically coupled probe, presumably mounted in a tool port on the turret. The clue is that there is an optical sender / receiver mounted on the same plane as the Renishawe Tool Probe socket. No sign of the actual optical probe though.

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