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Recently have started to use my little ole lathe. My machining background stems from “repair” as opposed to “fabricating” and so one of the first things I did was acquire a 4-jaw chuck.
After having the lathe for near 5 years now, I discovered the bore of the 3-jaw chuck is smaller than the lathe spindle opening.
I did not have a reason to notice this discrepancy before because I hardly ever used the 3-jaw chuck until lately for some repetitive work.
Is this something we just have to accept as an attribute of the machine, or is there a three jaw chuck available with a bore opening as large as the spindle opening?
John
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You can bore the small 3-inch 3-jaw chuck out to 0.760 inches very easily. A better option is to purchase the 4-inch 3-jaw chuck from Little Machine Shop. Regards, John Mattis (retired mechanical engineer)
Recently have started to use my little ole lathe. My machining background stems from “repair” as opposed to “fabricating” and so one of the first things I did was acquire a 4-jaw chuck.
After having the lathe for near 5 years now, I discovered the bore of the 3-jaw chuck is smaller than the lathe spindle opening.
I did not have a reason to notice this discrepancy before because I hardly ever used the 3-jaw chuck until lately for some repetitive work.
Is this something we just have to accept as an attribute of the machine, or is there a three jaw chuck available with a bore opening as large as the spindle opening?
John
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I figured there was a simple answer to this.
Thank you!
John
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John, I see no reason why the three jaw chuck bore could not be bored out to a larger size, in fact I would want to increase the bore size to as accommodate larger material if space allows.
Dick
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I agree you put a bigger hole.
I have not had to bigger hole but I look at the scroll bearing size the hole needs to smaller that bearing.
I typically buy chuck with hole size I want.
Dave
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Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
Roy
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What was so special about the reamer?
Dave
On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote:
Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
Roy
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Ya didn't have to buy one , they were loaners & aparently
some folks didn't return them . Imagine that
animal
On 11/24/24 8:09 PM, davesmith1800
wrote:
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What was so special about the reamer?
Dave
On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote:
Opening the spindle bore is easy. LMS used to loan short
shank reamers for that, until they didn't return. Doing it
with a boring bar or adjustable reamer is just a bit more
tedious. (Did mine before the reamers vanished.)
Roy
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I’m pretty sure you can figure out why “short shank” would be useful. Tony
From: 7x12MiniLathe@groups.io <7x12MiniLathe@groups.io> On Behalf Of davesmith1800 via groups.io
Sent: Monday, 25 November 2024 3:09 PM
To: 7x12MiniLathe@groups.io
Subject: Re: [7x12MiniLathe] Three Jaw Chuck / Spindle Bore Opening What was so special about the reamer? On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote: Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
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I had turret lathes and screw machines. Everthing was short.
Most drill bit are screw machine length even upto 2⅛" size.
Reamers I buy long because it lower cost can cut the shank down.
Dave
On Sun, Nov 24, 2024 at 10:00 PM, Tony Smith wrote:
I’m pretty sure you can figure out why “short shank” would be useful.
Tony
From: 7x12MiniLathe@groups.io <7x12MiniLathe@groups.io> On Behalf Of davesmith1800 via groups.io
Sent: Monday, 25 November 2024 3:09 PM
To: 7x12MiniLathe@groups.io
Subject: Re: [7x12MiniLathe] Three Jaw Chuck / Spindle Bore Opening
What was so special about the reamer?
On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote:
Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
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It had a shortened shank & (IIRC) a #2 Morse taper end to let it fit snugly in the TS. Cleaning it & removing the excess shipping labels from the package took longer than the actual reaming. Previous users had slapped so many new labels on top of the old ones that it was unwieldy.
Roy
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You’ve missed the (short) point being made. Again. Tony
From: 7x12MiniLathe@groups.io <7x12MiniLathe@groups.io> On Behalf Of davesmith1800 via groups.io
Sent: Tuesday, 26 November 2024 4:28 AM
To: 7x12MiniLathe@groups.io
Subject: Re: [7x12MiniLathe] Three Jaw Chuck / Spindle Bore Opening I had turret lathes and screw machines. Everthing was short. Most drill bit are screw machine length even upto 2⅛" size. Reamers I buy long because it lower cost can cut the shank down. On Sun, Nov 24, 2024 at 10:00 PM, Tony Smith wrote: I’m pretty sure you can figure out why “short shank” would be useful. Tony What was so special about the reamer? On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote: Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
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It was rather expensive for a tool you'd only use once in your life. Maybe setting up such a program again would be a good idea, with a hefty deposit to borrow the tool.
Mike Taglieri
What was so special about the reamer?
Dave
On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote:
Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
Roy
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Just build yourself a momma boring bar, a few light cuts is all it takes. That will even help with recentering the bore. Still much faster and cheaper than waiting for a reamer and paying for shipping/deposit.
It was rather expensive for a tool you'd only use once in your life. Maybe setting up such a program again would be a good idea, with a hefty deposit to borrow the tool.
Mike Taglieri
What was so special about the reamer?
Dave
On Sun, Nov 24, 2024 at 04:20 PM, Roy wrote:
Opening the spindle bore is easy. LMS used to loan short shank reamers for that, until they didn't return. Doing it with a boring bar or adjustable reamer is just a bit more tedious. (Did mine before the reamers vanished.)
Roy
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John Mattis
OldToolmaker
davesmith1800