On 12/26/23 02:35, Linden wrote:
On 2023-12-25 21:56, gene heskett wrote:
On 12/25/23 19:05, Linden via Emc-users wrote:
Hello All,
In the early stages of converting a 13 x 24 inch manual Chinese
lathe to run with Linux CNC.
I have 2 questions regarding replacing the Z axis lead
On Tue, 26 Dec 2023 at 00:08, Linden via Emc-users
wrote:
> The second question I have is what would be a realistic cutting speed
> range for the ball screw in RPM?
Ball screws have a maximum rpm rating, though I suspect you won't be
getting near to that:
A while ago I saw a photo of an old metal lathe, looked to be from the 1920's
or older, that had a lead screw on the front and the rear of the bed, connected
across the tailstock end with a pair of gears. That would have the screws
rotating in opposing directions so one would need to be left
Something that can be done with screw drives is put them under slight tension.
Attach angular contact ball bearings to both ends of the screw in such a way
they cannot slip, then make the mounts so they will put a bit of a pull on the
screw. Not enough to distort the threads.
The slight
pulley goes to the
stepper motor. I've not had any problems.
> -Original Message-
> From: Linden [mailto:l...@island.net]
> Sent: December 25, 2023 11:39 PM
> To: Chris Albertson; Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Ball Screw Driving Questions
&g
Thanks Chris
This is exactly the insight I was looking for now I understand why the
conventional mounting is always with the servo at the head stock end.
Linden
On 2023-12-25 22:35, Chris Albertson wrote:
When it comes to flexing and bending, think about the bed too. If the servo
motor
On 2023-12-25 21:56, gene heskett wrote:
On 12/25/23 19:05, Linden via Emc-users wrote:
Hello All,
In the early stages of converting a 13 x 24 inch manual Chinese
lathe to run with Linux CNC.
I have 2 questions regarding replacing the Z axis lead screw with a
3205 ball screw:
When it comes to flexing and bending, think about the bed too. If the servo
motor and pullies are mounted at the tailstock end, then the bed will carry the
reaction forces and see exactly the same tension and “twist” force as the
screw. But if the motor is mounted at the headstock end the bed
Thank you Leonardo,
That makes me feel better 2 to 1 reduction will fit easily in the
space available.
I should have been a bit more clear both ends of the Z axis ball screw
will be supported by ball bearings in pillow blocks. The head stock end
will have two bearings back to back with a
On 12/25/23 19:05, Linden via Emc-users wrote:
Hello All,
In the early stages of converting a 13 x 24 inch manual Chinese
lathe to run with Linux CNC.
I have 2 questions regarding replacing the Z axis lead screw with a 3205
ball screw:
What I am thinking is mounting the fixed end
Machines often have both ends fixed and the assembly preloaded by applying
tension to the screw.
> On Dec 25, 2023, at 7:03 PM, Leonardo Marsaglia wrote:
>
> Hello Linden,
>
> For your first question. I would mount the motor on a fixed end just to be
> sure, so that would lead you to make
Hello Linden,
For your first question. I would mount the motor on a fixed end just to be
sure, so that would lead you to make both ends fixed. I guess you can mount
your servo on a non fixed end if the machine is not going to be used for
heavy cuts on hard materials but I would go the extra
Hello All,
In the early stages of converting a 13 x 24 inch manual Chinese
lathe to run with Linux CNC.
I have 2 questions regarding replacing the Z axis lead screw with a 3205
ball screw:
What I am thinking is mounting the fixed end in a pillow block at the
head stock end of the
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