开云体育

  1. 7x12MiniLathe
  2. Topics

Lead screw

 

开云体育

Has somebody made a lead screw to be installed in the middle of the bed ?
I have looked into Youtube, but not found what I wanted.
The problem is twisting of the saddle when I return the clock wheel cutter.
( 144 teeth on an 88 mm diameter plate gives not much room for error)
The leadscrew shall be manual twisted.

Johannes
Mexico
 

That could be related to play in the saddle gibs.


On Mon, Apr 7, 2025 at 8:02?PM Johannes via <johannes=[email protected]> wrote:
Has somebody made a lead screw to be installed in the middle of the bed ?
I have looked into Youtube, but not found what I wanted.
The problem is twisting of the saddle when I return the clock wheel cutter.
( 144 teeth on an 88 mm diameter plate gives not much room for error)
The leadscrew shall be manual twisted.

Johannes
Mexico
 

开云体育

I have made 2 new and longer pressboards under the saddle in both x directions.?
They have also contact on outside to saddle.
2 of the 3 fasten screws on the front are now available from upper side for better control of the press.
Back side is no problem.
My lead screw is now manual operated.

(Much better than the big Hand wheel in front)

Johannes
Mexico







From: [email protected] <[email protected]> on behalf of mario mohl via groups.io <mario.mohl@...>
Sent: Monday, April 7, 2025 19:18
To: [email protected] <[email protected]>
Subject: Re: [7x12MiniLathe] Lead screw
?
That could be related to play in the saddle gibs.

On Mon, Apr 7, 2025 at 8:02?PM Johannes via <johannes=[email protected]> wrote:
Has somebody made a lead screw to be installed in the middle of the bed ?
I have looked into Youtube, but not found what I wanted.
The problem is twisting of the saddle when I return the clock wheel cutter.
( 144 teeth on an 88 mm diameter plate gives not much room for error)
The leadscrew shall be manual twisted.

Johannes
Mexico
 

I made something similar for one particular application and find I use it quite a bit for general turning.
?
Mark
?
 

The basic problem is the design of the carriage!? The vertical play is adjusted with clamp & jack screws vaguely locating the clamp strips on the underside of the bed; that's common on larger lathes, doesn't scale down well for 7x? lathes. The fix is to replace the screw adjustment system with shims & have the clamp screws tight. It can get a little tedious if the underside of the bed is uneven, requiring some work with? curved files, "rifflers."
?
Roy

1 - 5 of 5