[4]

Tramming my mill... simple question.

[3]
[10] Like what you see?
Click here to donate to this forum and upgrade your account!

Pcmaker

Active Member
Registered
Joined
Jun 12, 2018
Messages
200
Likes
54
#1
I have a PM25MV mill and I'm trying to tram it using one of these. Tramming the X axis was pretty easy. I'm now within .001, but the problem is the Y axis. I'm off by .025.

There's 4 allen head bolts holding the column. I've done this before and I have to shim the front or back with feeler gauges until I get to within 1 thou.

My question is, will this mess up the "squareness" of the millhead to the table? I don't think it will because the table moves side to side, front to back, and not the column.

If I unscrew the 4 allen bolts, the colum is guaranteed to shift side to side, even if a tiny bit, which will ruin the squareness of the column to the base of the milling machine. Instead of the column facing directly to the front, it will be shifted sideways a bit.

 

murraym

Newbie
Registered
Joined
Feb 11, 2018
Messages
4
Likes
0
#2
yes you are correct. It does not matter.
 

JimDawson

Global Moderator
Staff member
H-M Platinum Supporter ($50)
Joined
Feb 8, 2014
Messages
7,142
Likes
5,393
#3
Won't make a bit of difference.
 

Pcmaker

Active Member
Registered
Joined
Jun 12, 2018
Messages
200
Likes
54
#4
Another quick question:

I tram my mill by lowering the quill on the Z axis and I try to get both needles on the indicators to move at the same time. is this correct? If it's off, I tap the side of the head with a rubber hammer and do so until I can get both indicator needles to move as close to each other as possible
 

murraym

Newbie
Registered
Joined
Feb 11, 2018
Messages
4
Likes
0
#5
Never having used a device like that to tram, i cannot say. But if i had to guess, i would say that you are correct again. looks like they should read the same.
 

JimDawson

Global Moderator
Staff member
H-M Platinum Supporter ($50)
Joined
Feb 8, 2014
Messages
7,142
Likes
5,393
#6
Getting the needles to move at the same time is not exactly correct. What you want bring the Z down until both indicators are loaded, then lock the quill or Z. You should first calibrate the tramming tool. Then adjust the head so that both indicators read the same.
 
Last edited:

dlane

Active User
H-M Supporter - Gold Member ($25)
Joined
Sep 27, 2014
Messages
3,003
Likes
1,417
#7
I had one of those I could not get repeatable readings with it the Chinese indicators were junk I sent it back.
I got a couple descent indicators and made my own . You do need to calibrate them
 

higgite

General Manger - Proofreading Dept.
H-M Supporter - Gold Member ($25)
Joined
Aug 15, 2013
Messages
831
Likes
873
#8
Another quick question:

I tram my mill by lowering the quill on the Z axis and I try to get both needles on the indicators to move at the same time. is this correct? If it's off, I tap the side of the head with a rubber hammer and do so until I can get both indicator needles to move as close to each other as possible
Why don't you just follow the instructions that came with the tool?
http://store-1wa94vq6.mybigcommerce.com/product_images/product_manual/pro_tram/pro_tram_manual.html

Tom
 
[6]
[5] [7]
Top