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Re: 3-jaw largest bore?

 

I know? 7" and 8" mini lathes have seen? spindle hole just over ?" . I can even find larger
Do some mini lathes have smaller spindle hole?

Dave?


On Wed, Jun 5, 2024 at 08:17 AM, MikeK wrote:
By the way, I calculated that boring the spindle to 13/16" reduces the MT3 contact from 3" to 2.5", if that should matter to anyone.? Though I don't suspect many people use the spindle taper for much.? I rarely used my MT3 collets because most of them would get stuck and even using them required removing the motor cover to get the carriage in position.
Re: 3-jaw largest bore?

 

By the way, I calculated that boring the spindle to 13/16" reduces the MT3 contact from 3" to 2.5", if that should matter to anyone.? Though I don't suspect many people use the spindle taper for much.? I rarely used my MT3 collets because most of them would get stuck and even using them required removing the motor cover to get the carriage in position.
Re: 3-jaw largest bore?

 

That is a small hole.
I can see why you want a bigger hole.?
The on the chart for a 3" is only 0.63"?

I just a 5" 4 jaw on my lathe it set up for a 4" chuck.? Need backing plate purchased? one from little machine shop.com

I purchased the from Amazon.??



Dave?


On Sat, Jun 1, 2024 at 03:40 PM, MikeK wrote:
I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been toolsandmods.com, but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike

Chuck data littlemachineshop.PDF
Chuck data littlemachineshop.PDF

Re: 3-jaw largest bore?

 

Sounds great.
Most almost same model of chuck 3 or 4 inch?

I will miss fun 4 jaw chuck and bars. It more taking on off chucks it time to do right.?

Dave?


On Sun, Jun 2, 2024 at 04:51 PM, Roy wrote:
The bending force is only applied to the distance between the chuck & adjacent bearing - the spindle between the bearings is not subjected to it. Opening the spindle & chuck bore to 13/16" works fine, I did mine years ago, before the LMS loaner reamers disappeared.

Roy
Re: 3-jaw largest bore?

 

True.? People have pushed the 7x lathe quite far.? Consider that the Grizzly and PM 10x22/30 lathes have only a 1" spindle bore.? And I definitely want one of those as well.

Mike
Re: 3-jaw largest bore?

 

The bending force is only applied to the distance between the chuck & adjacent bearing - the spindle between the bearings is not subjected to it. Opening the spindle & chuck bore to 13/16" works fine, I did mine years ago, before the LMS loaner reamers disappeared.

Roy
Re: 3-jaw largest bore?

 

You use 4jaw chuck?
I have 5" [125mm] has good size hole. It has 1?" 30mm size



On Sat, Jun 1, 2024 at 03:40 PM, MikeK wrote:
I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been toolsandmods.com, but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike
Re: 3-jaw largest bore?

 

You can but Hou have take chuck apart and find out how mush

Dave?


On Sat, Jun 1, 2024 at 03:40 PM, MikeK wrote:
I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been toolsandmods.com, but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike
Re: 3-jaw largest bore?

 

No, I fully understood what you were asking. I mentioned it as an aside. My apologies. Should have been more clear about that.


Doug.


On Sat, Jun 1, 2024 at 10:16 PM, MikeK via groups.io
<upand_at_them@...> wrote:
I never said that I wanted to bore the spindle.? Someone had misread or misunderstood my post.? My question, same as the thread title, was about the 3-jaw chuck.? If I can bore to 3/4" I'll be tickled some shade of light red.

Mike

Re: 3-jaw largest bore?

 

I never said that I wanted to bore the spindle.? Someone had misread or misunderstood my post.? My question, same as the thread title, was about the 3-jaw chuck.? If I can bore to 3/4" I'll be tickled some shade of light red.

Mike
Re: 3-jaw largest bore?

 

hi I took mine out to just shy of the screw threads
. Pete

On Saturday, June 1, 2024 at 03:40:51 PM MST, MikeK via groups.io <upand_at_them@...> wrote:


I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been toolsandmods.com, but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike

Re: Project New type of material

 

It could take longer with heat wave.
My wife and Doctors do not want meb work heat.?

Whe new lathe last November I wanted to know from Doctor what diet I should to live 20 or 30 years longer. Thinking it was going to green flufy with a drill flavor shake with hit of mint.?

So ask the question.?
How long can live with stage 4 cancer.?
Thd doctor replied?
No one makes pass 10 years.
It took me a few seconds to respond with.
I was diagnosed with stage 4 in 2009.?
The doctor respond with
I know.

At that point I realized the Green Fluffy Deit did not work.
I check with other doctors and Americans Cancer they said about same thing.?

So now everyone think I going to brake.?
So that is why it taking so long to work with my new lathe

Dave?
Re: 3-jaw largest bore?

Chris Albertson
 

¿ªÔÆÌåÓý

What is 13//16? ?I¡¯d guess about 20mm? ? Seems a lot of work for marginal gain. ? Then there are others who complain the mini-lathe is not very stiff. ?It would seem that boring the spindle even a little would not improve the stiffness. ? ?And YES it matters. ?All the cutting force that bends the frame and the bed is transmitted through the spindle.


On Jun 1, 2024, at 4:12?PM, Doug Pfaff via groups.io <justicekrieger@...> wrote:

Should be able to go out to say 13/16" with a boring bar. Owner of Little Machine Shop used to loan out a 13/16" reamer to ream the spindle bore.
Re: 3-jaw largest bore?

 

Okay, thanks guys.
Re: 3-jaw largest bore?

 

I too have collets, but I also purchased a 4 inch 3 jaw from little machine shop that I mostle use.
Regards,
John Mattis (retired mechanical engineer

On Sat, Jun 1, 2024 at 4:28?PM John Los via <iron2old=[email protected]> wrote:
I bored my 3" chuck out to 3/4". I no longer use the chuck very often, as I do most of my work with collets now.? Looks like 13/16" would work, but it looks like you would cut into the heads of the 3 little screws the hold the plastic disk in the back of the chuck.? ----- John

Re: 3-jaw largest bore?

 

I bored my 3" chuck out to 3/4". I no longer use the chuck very often, as I do most of my work with collets now.? Looks like 13/16" would work, but it looks like you would cut into the heads of the 3 little screws the hold the plastic disk in the back of the chuck.? ----- John
Re: 3-jaw largest bore?

 

You can bore the 3 inch 3 jaw out to 0/760 diameter so 3/4 inch stock will pass through
John Mattis (retired Mechanical engineer)

On Sat, Jun 1, 2024 at 3:40?PM MikeK via <upand_at_them=[email protected]> wrote:
I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been , but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike

Re: 3-jaw largest bore?

 

Should be able to go out to say 13/16" with a boring bar. Owner of Little Machine Shop used to loan out a 13/16" reamer to ream the spindle bore.
3-jaw largest bore?

 

I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search.? It may have been toolsandmods.com, but that site appears to be defunct now.

I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore.? It was really tight.? How big can you go without causing issues?? I know the screws holding the back cover on are already close to the bore.

Mike
Re: Project New type of material

 

Do have delays in work .
Yesterday it was replacing flush valve.? Today is blood and seed for lawn .?

I hope do try a cut today.

The other is health I have stage 4 colan cancer since 2009. FYI I told in 2009 I have stage 4. The treatments makes me tired.? I have had 106 chemotherapy treatments.? Now on a new out in November 28 2023 drug call? FRUZAQLA.? I did post my wife's? deit on American Cancer so all know what did.?

Dave?


On Thu, May 30, 2024 at 08:43 AM, Ralph Hulslander wrote:
Dave, we want to see what you do!
?
Ralph

On Wed, May 29, 2024 at 11:13?PM davesmith1800 via <davesmith1=[email protected]> wrote:
Thank you all for information.?
Looking forward to machining the plexiglass?

Dave?

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