Post by 3dprintingmeathead on Mar 20, 2017 21:23:02 GMT
Like ralf, I noticed the y motor bracket isn't the most secure. It works, but if you over-tension the belt, or bump it, you can easily bend it and knock it off skew.
There are some metal nema 17 brackets out there, but they don't really fit the bill for a few reasons.
brackets like
have the wrong spacing for the mounting holes. The mounting points need to be centered on the output shaft, in order for the y carriage to slide over the motor. the motor also doubles as an endstop kick plate, so it's location has to be pretty close to it's current arrangement.
It could be benneficial to raise the whole y carriage and rails up, to use these brackets easier. That type of arrangement would allot the use of a proper y belt tension-er, as there is not enough room on the inside of the y axis idler to use one. The Y carriage travels too far forward and would hit it.
This arrangement would mean you would lose maybe 20mm of build height though.
You could drill 2 holes in the center of the bracket(always use 2 mounting points, one is not secure enough and allows the motor to shift), but you may have to trim the bracket down because it is wider than the motor and might not have enough clearance for the y carriage.
3d printing one is an option, but it would have to be very thick to support the motor properly over such a small area.
For now, this leaves me with the conclusion that no upgrade is currently necessary for the bracket. But a regular check on the motor, making sure the belt is riding in the center of the pulley is recommended. If it is not, bend the motor until it is. If it is way off, you might have to slide the pulley up or down the shaft until the belt rides in the middle. This is a finicky process, so some trial and error is necessary.
There are some metal nema 17 brackets out there, but they don't really fit the bill for a few reasons.
brackets like
have the wrong spacing for the mounting holes. The mounting points need to be centered on the output shaft, in order for the y carriage to slide over the motor. the motor also doubles as an endstop kick plate, so it's location has to be pretty close to it's current arrangement.
It could be benneficial to raise the whole y carriage and rails up, to use these brackets easier. That type of arrangement would allot the use of a proper y belt tension-er, as there is not enough room on the inside of the y axis idler to use one. The Y carriage travels too far forward and would hit it.
This arrangement would mean you would lose maybe 20mm of build height though.
You could drill 2 holes in the center of the bracket(always use 2 mounting points, one is not secure enough and allows the motor to shift), but you may have to trim the bracket down because it is wider than the motor and might not have enough clearance for the y carriage.
3d printing one is an option, but it would have to be very thick to support the motor properly over such a small area.
For now, this leaves me with the conclusion that no upgrade is currently necessary for the bracket. But a regular check on the motor, making sure the belt is riding in the center of the pulley is recommended. If it is not, bend the motor until it is. If it is way off, you might have to slide the pulley up or down the shaft until the belt rides in the middle. This is a finicky process, so some trial and error is necessary.