Presto 8dg refurb. (Lathe porn)

This is where record cutters raise questions about cutting, and trade wisdom and experiment results. We love Scully, Neumann, Presto, & Rek-O-Kut lathes and Wilcox-Gay Recordios (among others). We are excited by the various modern pro and semi-pro systems, too, in production and development. We use strange, extinct disc-based dictation machines. And other stuff, too.

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 41536Unread post sameal
Wed Mar 23, 2016 7:50 pm

After much emailing, and sending bushings back for different ones, i finally pin pointed exact motor bushing replacements.

Contacting lord directly, i got the shear bushings out of them fairly easy, but when i brought up the motor mount bushings and the 45 plate bushings, i got hints and the data sheets. Which i attempted to decifer, contacted and verified measurements with mcmaster carr and promptly ordered the wrong bushings. Luckily, mcmasters customer service and return policy is pretty great and i located at least the correct motor assembly bushings and made the swap.

They fit perfect, and i got a half an inch rise back for connecting the filter disc to the anvil.

So to save some other people trouble, the 4 "surface style plate form mounts" for the presto 8dg are

Mcmaster carr number:6008K26

Mcmaster carr does not carry the 45rpm plate bushings. They have similar products, but none in the size needed.

Old vs. New you can see they rotted out and the motor plate made a silver indentation in the rubber bushing from resting basically on the bushing mount.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 41558Unread post sameal
Thu Mar 24, 2016 2:14 pm

Is there any reason anyone can think of why the 45rpm plate couldn't be mounted on the back side of the motor?

It would be easier to service and out of the way of the oil gauge there

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 42227Unread post sameal
Sat Apr 30, 2016 1:29 pm

Its been a bit.

Im kinda at a down point until the 45 puck is rerubbered and the cutter electronics come back. I have an ametek vac im trying to build into the suction/platter system, but i had a setback that damaged the armature. Ive filed it down and repaired most of the displaced material but still have some sparks.

So as a break, i made this to hang on the wall
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 43074Unread post sameal
Thu Jun 23, 2016 10:25 am

Ive now made some headway on the vacuum system. I very stupidly plugged in the vacuum motor and sent it spinning, causing some minor damage. I think i have the motor repaired and ready to fit into a box i can sound dampen im hoping.

Im half thinking, since i dont have a front cover for the lathe cabinet anyway, tapping rack screw holes and mounting the devices in front. But the other half of me thinks to mount the devices on the shelf inside, and build another layer of sound dampening around it.

Im still fabricating the missing foot pad for the cabinet. Im pretty close.

Im also thinking of moving the "dish" on the far left side of the platter anvil and mounting the tonearm there. Then moving the "dish" in front of the overhead arm.

Slow going.

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Gridlock
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 43090Unread post Gridlock
Fri Jun 24, 2016 6:48 pm

Put a book under the corner and fire it up
<\\\\\\\\\\\\\\\\\\\\\[[[[[[[\/]]]]]]]\\\\\\\\\\\\\\\\\>
Recordette Sr.......Presto K-8

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 43100Unread post sameal
Sat Jun 25, 2016 8:35 pm

Gridlock wrote:Put a book under the corner and fire it up
Oh how i wish it was that easy.

Im still needing the 45 rpm "puck" rubbered, some kind of motor system for the lpi setup, need the cutting electronics repaired, the tonearm mounted, the vacuum system and chuck built and probably more adjustments.

Otherwise i got blanks waiting for the groove.

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Gridlock
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 43101Unread post Gridlock
Sat Jun 25, 2016 11:40 pm

Considering rational thought patterns and how much getting electrocuted sucks (try to keep one hand in your pocket so your body doesnt complete the circuit) you should take your time but hey man were not gonna live forever. If you got a passion do it. you will end up being a role model for everyone around you which is kinda rare these days and especially with analog sticklers and other timetravelling types...
<\\\\\\\\\\\\\\\\\\\\\[[[[[[[\/]]]]]]]\\\\\\\\\\\\\\\\\>
Recordette Sr.......Presto K-8

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 44278Unread post sameal
Sat Oct 08, 2016 7:22 pm

Well, it has been awhile.

I've finally got my vacuum system together i think after much trial and error.

I don't like the light dimmer on the lower settings. It seems to "chug" instead of run smooth. I can't decide what to do with that. Im open to suggestion!

The real test will be how it handles the platter and swarf. We shall see.

And i made a holder for the tonearm. I'll be swapping the motor caps to the correct values too.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 44299Unread post sameal
Sun Oct 09, 2016 6:08 pm

Let there be light!
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 44314Unread post sameal
Mon Oct 10, 2016 7:57 pm

Chuck prototype one: I hate it!

I used some ball bearing type bearings, unsealed and rugged, but too "skippy" for a chuck i think. I need precision bearings.

However i can cut and route vacuum hose with this proto in mind. It'll work for tests i think. Lets see what the vacuum thinks.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 44544Unread post sameal
Sat Oct 29, 2016 7:36 pm

Made a makeshift playback arm area. Very rough obviously.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 44948Unread post sameal
Sat Nov 26, 2016 3:01 pm

Did a little more rough-in work on the playback arm setup. Im gonna do some test plays hopefully, then really clean it up. Im hoping i wont get any noise from the mechanics transfering.

There's really almost no other place for the arm to sit and not be in the way. So i'm really hoping this setup pans out.

Anybody have rumble on there recordings with an 8dg?
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 45319Unread post sameal
Mon Dec 26, 2016 7:33 pm

Tonearm plays back and mono switch functions appropriately. Just some fine tuning left.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 46316Unread post sameal
Sun Mar 05, 2017 6:22 pm

Revised "macuume" and playback arm.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48136Unread post sameal
Sun Oct 15, 2017 10:26 am

Pitch motor v.1 had plenty of rumble through to the platter, but moved the carriage. Time for some dampening.
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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48166Unread post sameal
Wed Oct 18, 2017 11:44 pm

Thanks to kris D, i finally found who owned my lathe.

http://www.franastat.com/ap/ap_home.html

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48235Unread post sameal
Fri Oct 27, 2017 10:27 am

For anyone needing their rubber puck redone, i had mine done with terry's rubber rollers to excellent success.

I could not find the original measurements anywhere, from anybody, so i measured the gap from the capstan motor to the filter disk and added a millimeter.

1" 22/32nds worked pretty good for me.

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petermontg
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48242Unread post petermontg
Sat Oct 28, 2017 9:21 am

sameal wrote:For anyone needing their rubber puck redone, i had mine done with terry's rubber rollers to excellent success.

I could not find the original measurements anywhere, from anybody, so i measured the gap from the capstan motor to the filter disk and added a millimeter.

1" 22/32nds worked pretty good for me.
Thumbs up for Terry. Sameal. your lathe is fairly taking on a life of it's own now. Fair play to getting it to this point. Thank you for documenting.
Peter Montgomery
+353(0)894926271
peter(at)petermontgomerymastering.com

Stereo cutter head wanted. Send email or smoke signals.

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48261Unread post sameal
Mon Oct 30, 2017 10:46 am

Thanks peter.

Now im working on a depth coil and solenoid setup. I think it's possible to squeeze one on here.

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sameal
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Re: Presto 8dg refurb. (Lathe porn)

Post: # 48268Unread post sameal
Mon Oct 30, 2017 4:02 pm

Lots of thanks to soulbear and epicenterbryan for guiding me so far. Lots of really good ideas coming out!

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