I’ve been tuning my new Maslow, and have been trying to dial it in as much as possible. I’ve found a possible issue along the way.
I used the calibration menu to determine my motor spacing using the chain. This value was 3102.13mm. I then used a tape measure to measure my motor spacing, and got a value of 3111mm, about 9mm off. As far as I could tell, chain sag is not a substantial component of this, in particular because chain sag would make the chain-based measurement appear longer than it actually is, rather than shorter.
I then performed some measurements on my chains, and found that they aren’t exactly 6.35mm per link. I looked through the forums and found that others have found that the chain lengths can be variable, such as @blurfl in this thread.
Being a mechanical component, it’s entirely reasonable the chain links would have some manufacturing tolerance to them. I’ll strictly consider brand-new chains for the time being, as combining the element of worn chain makes this even more complex. I did some very brief research, and found one company listed a tolerance of +0.001/-0.000" per link.
Using this tolerance, my chain-measured motor spacing of 3102.13mm could actually be as long as 3114.5mm. This is in the region of being able to explain the amount of error I saw.
Has anyone else seen this? If this is true, this presents a significant problem. Knowing the lengths of the chains is critical to the operation of the machine, and if this level of variance is possible then it sounds like something we may need to address.
Do we know the tolerances of the chains we get? Do we possibly need to incorporate a chain length calibration into the machine, possibly by manually measuring the motor spacing and then using that to calculate the more accurate chain pitch?