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Using the mini lathe

 
Edited

My ok to polish the knives today as long not over 10 minutes. It also 98¡ã in hobby shop at 10:30 today.

This what used to polish the knives.

Hope you put other uses for your mini lathe here for all to see.




Still could not turn the plexiglass rod it take to long in 108¡ã F day.?

Dave
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
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