Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 3 of 3
-
6th Jun 2018, 09:48 AM #1Senior Member
- Join Date
- Mar 2017
- Location
- Brisbane
- Posts
- 245
Allowable y axis overhang for extending the travel?
I've seen a few people have the mill table of bench top machines move out on the y-axis beyond being flush with the saddle.
My question is how much is ok? I am trying to size a y axis ballscrew and I need to allow for this, as well as a kind of riser for my servo so it is positioned further back to let the y-axis come out.
An example: https://youtu.be/k2F6100RKOE?t=432
You can see his y-axis coming out further than usual here at about 7:10
I have read that tables with larger saddles are more accurate, and this would explain why surface grinders have enormous tables/saddles with relatively little x movement. Less overhang is better. Still, how do you calculate what's acceptable?
I posted this in cnczone too, I am just hoping here it might attract the eyes of someone who knows as I need to order ballscrews soon. Thanks.
-
6th Jun 2018, 10:07 AM #2Most Valued Member
- Join Date
- Aug 2011
- Location
- Melbourne
- Posts
- 4,779
As you would expect, the more a table overhangs the saddle, the more it will droop. One thing you can do is put a dial indicator from the head of the mill and touching the table. As the table extends from the saddle you will be able to measure this droop and pick a figure that may be allowable to you. I think it's just a matter of trancating the table travel to an acceptable figure.
Adjusting the gibbs so that are snug (but ot tight) will also reduce this droop.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
-
6th Jun 2018, 01:28 PM #3Most Valued Member
- Join Date
- Aug 2011
- Location
- Melbourne
- Posts
- 4,779
PS. Also using your mill with the table extended will create more wear on your saddle.
Simon
Sent from my SM-G900I using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
Similar Threads
-
Extending trailer stub axles?
By simonl in forum TRAILERS & OTHER FABRICATED STUFFReplies: 24Last Post: 27th Feb 2018, 06:40 PM -
Micrometer Travel Stops
By Anorak Bob in forum METALWORK GENERALReplies: 28Last Post: 5th Mar 2015, 09:35 PM -
extending frame of tandem trailer
By firstchoicecp in forum TRAILERS & OTHER FABRICATED STUFFReplies: 5Last Post: 16th Oct 2012, 05:00 PM -
Extending tailstock quill travel
By Big Shed in forum METALWORK GENERALReplies: 6Last Post: 16th Dec 2009, 09:07 PM -
Bantam Topslide Travel
By electrosteam in forum METALWORK GENERALReplies: 1Last Post: 17th Sep 2009, 09:24 AM