I am doing a 2 sided project, aligning all vectors to the center of the material, and I noticed they are off set. by about .2”. When I used my auto zero touchplate it seems to be about .04 off from centering on the the x and y axis. Is this a setting in g sender? I could not find one, or has my auto zero plate become inaccurate?
gsender1.5.1, vectric desktop 12.504, altmill 2x4
@Shellshock I don’t believe that the touch plate can ever go out of alignment.
I suspect that the issue is with the double-sided aspect of your project. When you say that your alignment is out, is this when you flip the material? How are you aligning your material when you flip it? I assume that you are not re-setting XY0 when you flip it, correct? You should not be.
How can you probe XY for the center of the material?
If your relying on probing a corner and then jogging half the width and length of the material and resetting XY zero there I think your in for a hard time as far as alignment goes. Too many things have to be almost perfect in order for it to work.
If your not using holes and dowels, without resetting the XY during the flip, I suggest looking how to use dowels for two sided work. The 3 hole method is fine if you only need to access the first side once.
If you need to get both sides more than once for inlays or something I can explain how I do that if you need.
nope, I use the same xy zero. I have aligned all of the vectors to center of the workpeice. When I flip it I have a stop on the right side that I push up against. I always blow out any dust.
I have used dowels on another project. This one is so small I don’t know if I have room. I’m really more concerned about the fact that when I auto zeroed It didn’t look like the bit was centered on the edge.
I did a test cut and it worked much better when I moved x and y over about .04” from where it auto zeroed to.
@Shellshock Obviously, you can choose the process you want for double-sided jobs - as can I.
There are many, many tutorials and videos on creating double-sided jobs and virtually all of them rely on 2 or 3 dowel pins through the material to ensure perfect alignment. I’ve never had a failure using this technique.
I wish you luck in your future projects. I stand by my opinion that your issue is not being caused by the touchplate. Since you cannot use the touchplate to set XY0 in the center of material, and since you are not re-setting XY0 when you flip the material, I believe that my position is correct. I am certainly open to being proven wrong though. It won’t be the first time. 
Okay, I see how being really small can complicate things.
I would suggest using a V-bit to zero with, if your not already, as it’s easier to check than an end mill. You’ll have to swap bits and do the Z separate. Also as corners tend to get dinged, squashed etc, I’d check the X and Y alignment separately a little ways from the corner.
I don’t have the AutoZero but I think it needs to be in the right mode for different bits so double check that too.
EDIT: Also if your using a micrometer to measure the stock and using those dimensions in CAD your mill has to be calibrated to your micrometer. Lets say your mill is calibrated a touch small and your calipers a touch big, it all adds up.
this is where auto zero is putting the bit. 1/4” downcut endmill
1/8” ballnose
definetely right of center of the bit. Am I wrong?
Where can I find the settings for what autozero touchplate recommends using for a bit?
I am completely confused. The pics show that you are setting XY0 to a corner of the material.
However, in your description, I thought that you were saying that your XY0 was set to the centre of the material.
In re-reading your posts, I see where I may have gone wrong. You are not setting XY0 to the centre. Your vectors are centred on the material. Correct?
As for the settings for the auto zero touchplate, look here
yes, my vectors are centered my xy zero is lower left corner
Nope, your not wrong. Without seeing it I didn’t realize how obviously wrong it is. It’s been quite a few years since I switched to metric, kinda forgot how big 0.04” is.
EDIT:
This had me thinking that zero was ultimately set in the center of the material which probably made some parts of my responses confusing. Sorry about that!
no worries, I’m a total noob here so I’m sure my nomenclature is a bit rookie.
FWIW, I’ve noticed that the latest version of gsender doesn’t handle the xy zeroing on the bit in the same way. This is my off season due to lack of ac in the shop. When things cool off i’m sure I will have more specific data as I do a lot of 2 sided operations.
@Shellshock what style of probing are you using for the AutoZero (auto or choosing the specific bit), what units do you have gSender in, and is your material square to your machine/is your machine out of square?
The amount you pictured is not an amount that should ever be impacted by the AutoZero geometry, the aluminum block with hardened nickel coating hardly changes shape over time. It would have to be something else causing the issue
My machine and sender are using inches. I am using auto probe and my machine and the stock are square. (Last calibration was within .0025” of square
@Shellshock For your ball nose, you may want to try using “tip”, as the touchplate documentation sets out.
It is setting the zero xy on the centerline of the bit. It looks like the end mill and ball nose are in the same position based on a guess at centerlines in the picture. If when you flip the board and you use a different corner of the wood to set 0xy it might make difference.
@kimsey.pollard FWIW, the pic of the end mill does not look to me to have the centre of the mill at the corner of the material. It may just be the pic, though.
Maybe you could try toggling gSender to use mm just to test if that changes anything. Also just to clarify
are you saying that you set $13 = 1? In that case I’d suggest also reverting that to see if it has any impact
