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Colchester 1965 Roundhead Lathe Restoration Project

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wa5cab

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The best way is to measure the diameter and groove width of the shaft. Of course, that requires at least partially removing the shaft from the gearbox.

If you can't do that, first determine whether the machine is inch or metric. Then look at the appropriate tables noting that they are sorted by material diameter. Determine what the nominal material diameter of the old one is. Note that they only come in certain diameters, so determining which yours is should be simple. The tables give both nominal diameters and actual.. Then find a cylinder (a socket set may supply one) that the O-ring just fits without stretching. Measure the OD of the O-ring while on the cylinder and pick the nearest diameter from the section of the table for your material diameter. The flat on the OD of your old one is probably due to wear, so the original OD was probably slightly larger. The actual ID of the O-ring should be a few thou smaller than the ID of the groove so that it is a snug fit and doesn't have to bunch up during assembly.

Parker sells rubber lubricant in small tubes. This will aid in assembly. McMaster won't call it Parker but whatever they have will work.
 

Kroll

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Na, not since I discover that I have couple oil leaks to fix.I did run it alittle while in low speed it runs quite,but took it up few notches and I could hear a peaking noise coming from the head.Which that may be normal,or it may not be but will check that out once I figure out the o-rings.But from that point and for next couple weeks I am working on a bender/shear doing the clean up,primer and paint etc for a very good person which is what is allowing me to invest into my bad habits such as this lathe.So its on hold for a couple weeks or when I hit a stopping point like waiting on some parts.
Techie were you going to go through your lathe,doing a cleaning?
 

Kroll

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Guys I am one happy man,today I discovered the reason why I was leaking oil.Watch the video and I will point out what I forgot to put back in.And on the back side behind the pulley is another shaft plug which I also forgot to install a set screw which was also leaking oil.On the first video it sounds noisy but its not.Sec video I speed up the rpm there is a sound that maybe is coming from the belts which is coated with the leaking oil.So I believe the oil leaks are fix but want to run it some more just to be sure.Any thoughts?Thanks guys----kroll
Edit: Have to wait till I figure out how to post a video
 
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Holt

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Hi there, I am totally new to this site, only signing up today, an seeing your restauration for the first time, it just looks beautiful.
I have the big brother or sister if you prefer, the Colchester Triumph from 1958, that I restored, but didn't paint, which I regret seeing yours.
These lathes have a history of noisy heads if the belts isn't exactly the same length, you could try removing all but one belt to see if the noise disappears.
 

Kroll

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Thank you Holt,I hate to say it but glad to hear that.Never heard one before so this was my first time,didn't know if the noise was normal.
May I say WELCOME! Fantastic people here.If you get a chance please post some pics,paint/no paint their all good---kroll
 

Holt

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I might just do that, I have a lot of pictures from the restoration and some upgrades I have made to it, some of the pics have been shown on other fora, and some have not. I have made my own QCTP, home made DRO from TouchDRO software, and I have a set of 5C collets that needs an adapter and drawbar I will be making as well.
Can I use pics from Photobucket, or do I have to upload them to this site? I will of course be making my own thread with all this stuff.
 

Holt

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81021180_20022012161747_3203_3.jpg

Just wanted to show what you have coming, this is the lathe when I saw it the first time.

81021180_20022012161747_3203_3.jpg

81021180_20022012161747_3203_3.jpg

81021180_20022012161747_3203_3.jpg

81021180_20022012161747_3203_3.jpg

81021180_20022012161747_3203_3.jpg
 

wa5cab

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Holt,

It's probably better to upload them here for several reasons. Just be sure to resize to around 200 KB first. Xenforo has no re-sizing capability. And also choose full size, not thumbnail. Some people report extremely slow load times from thumbnail, for reasons we haven't been able to determine. Plus if you load them full size, you can intersperse comments or identification for each photo.
 
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Kroll

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Thank you Robert,my photos are to much in the face pics.Holt that is one nice lathe,if and when you get a chance please do explain your upgrades.Love to hear your story on your restoration,also love the ideal of DRO on a lathe.I know its never to late,this lathe has been one of my biggest projects that I would love to make it better over time.
 

Str8jacket

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Very nicely restored mate! Ive been quietly watching your progress as you started about the same time i did. Must admit i didnt paint mine so she isnt very pretty. I had some issues with vibrations at higher speeds. My lathe head is very quiet at all speeds but the vibration was very prominent at 1000rpm.
I would put the best quality cogged/toothed belt you can get your hands on. After much heart ache with belt matching etc and getting more vibration from multiple belts not tracking the same i went to a single belt.
The good thing is that a new quality single belt can easily handle the power requirements of older tech multi belt arrangements. In the specs of my belt it is good for 10hp by itself. More than enough for any of these. Be cautious on over tensioning them too as you can easily cause failure of the input shaft bearings, or in my case the bushes someone had installed in a previous repair.
Have fun, time to get it dirty again!
 

Kroll

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Thank you for the kind words,its one of those projects that I am enjoying.But hit a snag with my input shaft,someone before me modified it by installing a bearing where the oil seal should be and they had bored it out to where the bearing would fit.Check out my other post in this section under Oil Seal.Thanks
 

Kroll

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Good morning guys,well I am finally making some progress on my lathe which oil leaks have been repaired.Replace the bushing that for the gear on the swing frame then retest running it through all the speeds.While doing so I notice kinda like a hammering noise coming from the spindle head in all speeds during low gear,high gear all is perfect.So going to take the cover off,lay a piece of glass over the opening and run it to figure out what I have wrong.The problems that I have been dealing with on this lathe is in this section under Oil Seal which I kinda wanted to keep this post problem free.Just posting the process----kroll
Pics to come
 

machinst Jo

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I just read the whole thread, I'm fully impressed could stop reading. I was wondering how things have gone with your lathe since April?

Sent from my HUAWEI H892L using Tapatalk
 

hermetic

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could be belt noise, be careful to use matched belts, still watching with interest!
Phil
 

Kroll

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Match belts is something that I need to invest in.Thanks Jo I hope that my post will help others cause others post and the responses that I receive has surly help me.Up to this point I have had to take a break because of a previous comment which is what has help me finance this lathe.Only thing that I know that I need to do is to get the head lined up with the lathe.The 4 bolts that holds the spindle head down is hard to get to and the adjustment screws which will move the head left/right is also hard to get to.During the summer it is hot a heck in my shop which I really need to get this final adjustment spot on,with sweat running down my head to my eyes its just not good.Once I get started on this final adjustment will start making some swarf, and start my projects for some of my woodworking machines.Only area that is kinda a question mark is when I was going through the speeds I could hear a tapping noise or hamming noise on the higher speeds.So I need to check that again with the clear glass looking at the gears during high speed to see if I spot a problem.Anyway thanks for asking,as soon as I get caught up,and finish my other project my plan is to go back to the lathe.
 

Kiwi

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Matched belts off the shelf I've never had an issue with them but then not done a lot with multi belt set ups now matching old with new is not a go or belts from a different manufacturer whilst they are supposed to be the same in circumference I think the composition difference allows for a variation in stretch So buying all the same brand of belts at same time from the same supplier try and get them out of the same box helps, there will still be a variation but will stretch out in time and any vibrations will fade in a short time of coarse it's only relevant to the higher speeds Just my take on belts hope it helps
 

Kroll

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Good afternoon guys,well today I made alittle progress in two ways.I am in the process of getting my headstock in alignment but I only have a piece of stock that after getting it chuck up there is only 4" to turn which I been told that 7" is just right so I'm short.So since its all I have on hand,I though I would just go ahead and turn an OD just for play and see if over 4" how much its out.I be dang this is fantastic,I know its metal working 101 but this lathe is so nice.The compound is nice that I can make those fine adjustments.So for the very first time using the lathe I am calling it a success,but not being familiar with Colchester I hope that the noise I hear is normal.I do want to run the lathe at all speeds and do alittle turning just to check it out before I say that its a complete success.But for now I have a smile on my face and a sigh of relief :)
Oh after turning the OD over just the 4" length there is no difference,so I guess its close for now
 
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uncle harry

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Good afternoon guys,have very good news about my tumbler arm.But first thanks to Brain Coral aka Brian for putting me in contact with Mec-Elecpro.Not only did he make the repairs but tested the weld just to make sure it holds and he posted the repairs on Youtube.For your entertainment purpose is a link to it
Thanks for following me on the repairs of my lathe and seeing first hand what a wonderful person Mec-Elecpro is.
Thanks for sharing the video. It clearly parallels the instructions my dad gave us on how to weld cast. A nice reminder of a very talented man as well.
 
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