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Thread: dead centre.
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25th June 2012, 06:29 PM #1SENIOR MEMBER
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dead centre.
Recently at the wwws, i bought a dead centre, 60 deg, is there any particular reason why i shouldn't use it in the headstock to turn a tube between centres, either directly or on the mandrel purposed bushings? with the live in the tailstock.
I know about the longer stepped internal solid bushings and have seen them in use, love em, and i do agree they'd provide more support internally in the tube.
Not that i think my mandrel is an issue, just exploring alternatives to it for accuracy, how do you guys that do turn between centres go about it?
Neal.
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25th June 2012 06:29 PM # ADSGoogle Adsense Advertisement
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25th June 2012, 06:36 PM #2
If are wanting to turn between centres (TBC) then the dead centre should go in the headstock, providing the driving force and spinning with the bush/tube or mandrel, and the live centre in the tailstock also spinning with the bush/tube/mandrel.
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25th June 2012, 06:38 PM #3
No reason not to use your dead centre to drive your blank between centres ,bear in mind light cuts ,and you will have restricted space at each end of the blank to work with , but at least that way you get perfect concentricity between the tubes and the material you are turning cheers ~ John
G'day all !Enjoy your stay !!!
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25th June 2012, 06:47 PM #4SENIOR MEMBER
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I guess for clarity i get the purpose of the two, and in school i actually used a dead centre in the tailstock oiling/waxing and what not for spindles, my teach was "old" old school, and usually a spur centre in the headstock. I'm not used to seeing a dead centre in the headstock to drive stuff is all, and i was wondering about the heat if any and any other issue i might not have thought about or considered.
Neal.
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25th June 2012, 06:57 PM #5SENIOR MEMBER
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cheers guys so to use standard bushings or a bad idea? i imagine it'll be a balancing act as for the force to capture and drive the blank as opposed to slightly too much and blowouts by forcing the tube ends out or slipping and heat buildup for too loose? and there ya go, i'm pushing my tool rest length as is with a mandrel, might have to look into a much smaller one...
Neal.
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25th June 2012, 08:51 PM #6
hey neal
i use a dead centre and a live centre for when i do my CA finish and the final sanding as with the building up of the layers of CA you can sand the ends down more to sit better against the pen parts
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25th June 2012, 09:17 PM #7Novice
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25th June 2012, 09:35 PM #8
Neal this is a thread i started back in 2007 if i remember, may answer some questions fro you. https://www.woodworkforums.com/f69/no...-set-up-53900/
Cheers
Darren
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25th June 2012, 09:49 PM #9
This is how I do my turning between centres.
https://www.woodworkforums.com/f69/ne...entres-114902/
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25th June 2012, 10:46 PM #10SENIOR MEMBER
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Thanks fellers,
Helps a lot both those threads, i'm pretty much at Darren's point now, and was at the close of the wwws and didnt realise it, i didnt turn for a while and forgot i had the centre, then i was concerned for heat and bush stability etc. as i mentioned. And fred i saw some of your bushes at Greg's place the other weekend, very impressed, and i think your spot on, i think my oor issue is not so much in my mandrel as it is more in the lathe itself.
In perspective though i think my little mc900/wl18 has issues, some days it goes on centre without moving some days it moves the tailstock or headstock as i tighten up, and almost like it changes centre at different points on the bed wherever the tailstock locks up. Little bit frustrating where i can make a plain pen no worries but get the next segmented one i spent two days gluing cutting and drilling perfect oor.
I saw Gregs little woodfast was very accurate, the more i see of them the more i like em, i'd expect that from a fixed head though, Steve (Pariss) told me bout GPW's new little ones so looking at them now too for a pen specific lathe, and keeping mine for a bowl / platter / bigger things. Looking at my lathe i'm not sure on shimming it, if i'm going to move it (headstock) or what to do, i don't even know what the heck to shim it with... i'll give the between centres a go first though and see how it goes w/o the mandrel.
Rekon i might turn larger for a little bit, do pens as i need to (between centres, get used to that) and save some pennies for an accurate dedicated minni down the track.
Neal.
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26th June 2012, 06:34 AM #11
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