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13th November 2013, 08:28 AM #1
Setting up in a 4 jaw independant
New to this............jeez it takes a long time and a lot of fiddling. There HAS to be a secret!!!!
Cheers,
Jim
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13th November 2013, 08:41 AM #2GOLD MEMBER
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What is it you are setting up?
Is it a casting,or a piece of stock,has it already been machined?
Is it an OD or ID your setting up?
Is it a short piece of stock or is it long?
Are you using a surface gauge,pointer or indicator to set up?
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13th November 2013, 08:53 AM #3
Is it a casting,or a piece of stock,has it already been machined?
Round brass (machined 65mm round)
Is it an OD or ID your setting up?
OD
Is it a short piece of stock or is it long?
300mm supported
Are you using a surface gauge,pointer or indicator to set up?
Tried pointer and an indicator
I get it right and when I tighten down, it goes out of whack.Cheers,
Jim
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13th November 2013, 09:02 AM #4GOLD MEMBER
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Use two chuck keys
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13th November 2013, 09:05 AM #5
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13th November 2013, 09:19 AM #6GOLD MEMBER
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When you say supported are you using a centre at the tailstock or cat head or using a steady.
You will need to get chuck end running eye true 1st then give the outboard end a tap to get it running eye true.
Is the OD to be machined?
Using the 2 chuck keys is ok depending on the size of lathe you have or are using.
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13th November 2013, 09:21 AM #7
This was a big help to me FOUR JAW FUN - YouTube
The 2 key method works a treat, as does having an indicator solidly mounted and not in the way.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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13th November 2013, 09:25 AM #8
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13th November 2013, 09:44 AM #9GOLD MEMBER
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Probably best for you to describe the way you went about setting it up.
Was the outside pre machined prior to using the steady?
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14th November 2013, 01:21 AM #10Senior Member
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I use 2 chuck keys and a DTI and don't have any trouble setting things up in the 4 jaw chuck. If you are using a steady, get the job true in the chuck first, then set up the steady. Maybe getting it right quickly takes a bit of practice, I'm always amazed how easy a good tradesman can make a job look, and when I try it, it seems nearly impossible.
Regards
Bradford
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14th November 2013, 06:53 AM #11Philomath in training
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I've tried using 2 keys, I usually do it with one. Very much a practice thing, so the more you do it the better you will be.
Concentrate on doing 2 opposite jaws at a time. you will need to set those up, do the other pair and then do a little bit of minor adjustment to the first pair. Use the concentric lines on the chuck face for your rough positioning - that's what they are there for. Your indicator needs to be rigidly mounted so it can't be knocked. I prefer a DI to a DTI for this as it has greater range but use a DTI for internals. If you have a QCTP, make up a bracket to clamp in a holder so you can mount the DI on the toolpost quickly.
Once you have the chuck set then worry about the steady. Set that by putting it next to the chuck and adjusting the fingers then move it to the final position.
Michael
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14th November 2013, 09:35 AM #12GOLD MEMBER
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Hi there,
Plenty of advice already given so all I will add is that I too have had problems setting up a 4 jaw. It takes lots of practice with lots of different sizes and shapes to get good at it. When I say good I mean doing it quick, most people will get there in the end to the required run out, the more skilled people will just do it a lot quicker.
If I'm using a steady, I usually indicate off the steady as well once the 4 jaw is set, that way I know I have not forced the part off centre ever so slightly with the steady. Not sure if this is the done thing.
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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14th November 2013, 09:38 AM #13
Looks like I just need to practice practice and keep at it till I work out a system.
Cheers,
Jim
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14th November 2013, 01:47 PM #14GOLD MEMBER
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I should add, some days I nail the 4 jaw and get it spot on (no indicator movement) even if to the nearest 0.1mm is good enough. Then other days I may be working on something that requires tighter tolerances and be buggered if I can do it within 30 minutes and not chase my tail!
I figure as long as each jaw adjustment reduces the run out then I'm always heading in the right direction, even if it is a slow process. Practice makes perfect & thank god I'm not trying to do it for a living!
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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14th November 2013, 02:59 PM #15
Do you find when you tighten up though, things can go out of whack
Cheers,
Jim
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