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This is a wild shot but suppose must be asked.! . . .You have trammed the spindle haven't you.? Does the bottom of the pocket measure same as the top.?

Have you tried with a different vernier caliper or always the same one?

Ah ok my apologies also, now I read it again in this context I see it, I didn't before and just saw electrical noise and with you being an electronics Wizz and the other electronic bull shit that's...

Apologies - somewhat out of context. My reference to "noise" is related to babble rather than advice and to the value (or lack thereof) to the continued thread, and not a suggestion at all of...

No No No don't go complicating shit with that it's too consistent to be noise. It would be random and happening all over the place if it was noise.

Still haven't had an answer to if the tool has...

I'm adding noise now to this thread which I don't want to do but I understand (I think) where Jazz is coming from - it's unlikely to be a tool offset or deliberate behaviour by the controller simply...

I'm not sure it is because it would show error in the distance between the other pockets. The only thing it could be is if it was applying any tool offsets and he says not.!

My money is on the...

Ignoring all the individual line segments...

X lower extreme = 6.35, higher extreme = 43.65. Tool size specified as 12.7mm (6.35 rad), defines a X range of 0..50mm - I guess the operation...
...

Well a quick look shows that it should cut a 50mm pocket. The last move is at 43.65 and the tool 12.7mm so should hit 50mm provided the tool really is 12.7mm

...so the errors are not incremental - so I interpret that as the motor steps, scaling etc are all correct

"Indent is 49mm and the distance between indents is 51mm. They should be 50mm each" - I...

The fact you are cutting circles makes me wonder about the I & J moves, settings for those in the controller (if any), and anything associated with going around corners ?

This is a bit of a long...

Random thought and I'd appreciate anyone else explaining if I'm talking balls, If you home to 0,0 and manually drop the Z into a sacrificial board, raise Z, traverse e.g. G0X33 (you mentioned a 33mm...

This will be the pulse timing and I wouldn't mess with it if your not missing steps or losing position.

The fact your parts are the wrong size will be down to either a mechanical issue or simply...

Well, that is pretty much what you are doing so you can say you are not losing steps. However, if you search the forum Jonathan posted an Excel file that will produce G-code to run the machine around...

It depends on the controller and whether it looks at the rising or falling edge.

However it's easy to test. Just write some G-code that moves back n forth few hundred short moves, say 10mm, then...

AM882 doesn't detect missing steps it's got stall detection which is a different thing altogether. It also only works above 300Rpm.

Regards the wrong size parts then if the steps per is correct...

Sounds good to me. I'll step back and wait for the experts to comment!

Sounds like your "steps per unit" calculations have gone a bit wrong. Can you recheck, or post all relevant data here so someone else can check your working?

The other way of doing it is starting...

Hi everybody,
I am new in building diy cnc and was trying to build my first cnc with about 1000mmx1600 work area.
To make long story short I purchased kit from linearmotionbearings2008 on eBay...

These are the AC contact bearings I plan on using when I replace the rubish deep grove bearings in my Chinese BK12's for my Z axis.

http://www.wychbearings.co.uk/7001-2RS-MAX-Enduro.html

I...

You're not wrong there. When I wanted a couple of high quality AC bearings last year I found that the cheapest way of getting them was to buy a high spec. (FBT) BK12 from Fred @ BST and take the...

The C rating is the amount of radial play available when cold - C1 is the least, C5 the most, C3 is in the middle obviously and seems pretty common. The reason for the larger play is to allow for...

Replace them with normal.
When it comes to fitting angular contact to fit in BK blocks, finding the size at a decent price you'll be lucky.

Get the machine running and make your own bearing...

ADJUSTMENT ADJUSTMENT ADJUSTMENT... I've said this many many times in posts but I'll say it again because cannot be stressed enough.

With this fixed gantry design, you are going to need plenty of...

Need to look harder.!

https://www.motedis.co.uk/shop/Slot-profiles/Profile-45-B-Type-slot-10/Profile-45x90S-B-Type-slot-10::99999415.html