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11th Apr 2018, 01:28 PM #1Novice
- Join Date
- Jul 2008
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- Northcote, VIC
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- 19
Myford ML7 cross slide and compound screws
I feel like I'm falling down the rabbit hole here, but I recently got offered a Myford ML7 at a price I couldn't pass up. It has apparently been sitting unused in a shed for more than 10 years. it seems in generally good condition. not a lot of obvious wear, and without the damage that my ex-high school Hercus has. According to the Myford site, the serial number dates this lathe to 1953/54.
I've started the clean up and discovered that there are issues with both the cross slide and compound screws. The cross slide screw is slightly bent at the end so that the mazak dial is wobbly enough to bind each rotation.
the compound screw has obviously suffered some major damage at some point and a previous owner has decided to bodge a fix by tying the dial to the screw with wire, and keeping the handle on with a piece of allthread. Pics are below.
I've found the videos of the teardown and refurb of a ML7 by Geoffrey Croker to be useful: https://www.youtube.com/channel/UCUO...uqSL_rfzA3PENQ
So, my questions: as I have another lathe (Hercus ARM9), I guess i should make the new parts myself. But, I'm not that experienced. I was thinking of turning down the slightly bent cross slide screw to make a new compound screw. that means I'd have to make a new cross slide screw.
Where would I get 5/8-10 acme screw rod from? I'm in Melbourne. I'd rather not try and turn it myself as I don't have follow rest for the Hercus.
I'd like to make new nuts out of bronze - where would i get this from locally, and would I better off using leaded bronze or something else?
And so, the pictures:
The partially stripped lathe
1523273860108.jpg
The cross slide screw
1523273860431.jpg
The compound screw and dial
1523273860787.jpg
Thanks for any other tips Myford owners might have for a new owner!
Martin
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11th Apr 2018, 02:22 PM #2Banned
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- Jan 2018
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- Aldinga Beach.
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Ebay.
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11th Apr 2018, 02:51 PM #3Most Valued Member
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- Nov 2007
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- melbourne australia
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Martin,
You can get it from George White Metals in Clayton. I would use Phosphor Bronze.
George White | Australia's leading stockist & distributor of non-ferrous metals - Product ListChris
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11th Apr 2018, 03:16 PM #4Intermediate Member
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- May 2016
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- AU
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- 30
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11th Apr 2018, 03:17 PM #5Intermediate Member
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11th Apr 2018, 03:57 PM #6Senior Member
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- May 2015
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- Richmond
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- 214
Hi Martin. That thread you need is 3/8" x10tpi.
Enjoy the refurb on the ML7.
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11th Apr 2018, 04:00 PM #7Intermediate Member
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- May 2016
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- AU
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- 30
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12th Apr 2018, 05:27 PM #8Senior Member
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- Oct 2015
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- melbourne
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- 473
No chance of straightening it? Nothing to lose...
Russ
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12th Apr 2018, 05:39 PM #9Intermediate Member
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- May 2016
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- AU
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- 30
Yeah, I'll give that a go. It's only bent at the small threaded end, so I feel like it's more likely to snap at the transition from the larger acme thread.
The compound screw is stuffed though. I think I might convert to metric screws given how hard it is to find plain 3/8-10 acme rod.
Martin
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12th Apr 2018, 05:58 PM #10Most Valued Member
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- Jul 2016
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- Melbourne
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McMaster Carr in the states is one supplier but you have to use a freight forwarder.
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14th Apr 2018, 09:11 AM #11
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14th Apr 2018, 11:48 AM #12Most Valued Member
- Join Date
- Aug 2011
- Location
- Melbourne
- Posts
- 4,779
Highette Metals in Braeside sell many sizes of bronze round bar at scrap prices which is about $15 per Kg. I never buy new bronze when I need it. Of course it always depends on what they have at the time but I don't think they move that much of it as they always seem to have literally dozens of pieces in the racks. The hardest part is finding the right size or a piece that's not too big. Buying 10Kg of bronze bar at scrap prices may still be cheap but it adds up in price if you only need a small bush!
As for the bent leadscrew, at least have a go at straightening it. The X leadscrew on my (half finished) Pacific mill was bent after what appeared to be a collision with a forlift (or similar) straightened up quite well after some care and patience. The beauty of attempting to fix the damaged part is the fact that you have nothing to loose and everything to gain.
Good luck!
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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