2/3/2024 0 Comments Double sided magnets dormantTo secure the timing belt to the gantry plate, I used a 1" right-angled piece of scrap aluminum that I cut to about 50 mm in length. I mounted 3 more pulleys on to the gantry plate using a different length brass standoff in a V-pattern to maintain the tension in the timing belt. The timing belt that I used was a roll of GT2 timing belt (not a loop) that cut to the length that I needed.I made sure to adjust the spacing of the wheels by turning the eccentric spacers on 2 of the wheels until the gantry plate firmly secured and would start gliding when the V-Slot was tilted to one side. I mounted the gantry plate in the same way that it's mounted on the 20x40 V-Slot in the OpenBuilds kit. I bought four separate gantry wheels and a larger gantry plate to be compliant with my "40x20" setup.I used a 1/16" rubber sheet that I cut to the profile shape of the motor to insulate the vibrations from the motor, making the motor quieter. I mounted the bracket with 2 drop in T-nuts and mounted the motor to the bracket. I bought a separate flat aluminum bracket that was compliant with my "40x20" setup for mounting the stepper motor on the slide. The second pulley will be mounted to the stepper motor on the other side of the slide.Then, it's as simple as mounting the ball bearing pulley with screw on to the standoff (make sure that you don't tighten it too much). I used Loctite glue for added strength to the connection, since this pulley will have a fixed location on the slide. I then used an M2.5 brass standoff with a threaded screw extension and a lock nut to secure a mounting location for the pulley that is elevated off the V-Slot. I made mounting locations for the one of the pulleys that support the timing belt by drilling a hole close to on end of the slide, between the two V-Slot channels.After choosing and cutting the length for my "40x20" V-slot, I began mounting the necessary hardware for gantry plate slide: I will go more in depth to how I designed my custom linear slide, but if you choose to use the V-Slot kit from OpenBuilds, you will have to follow their guide for more information. Using a horizontal V-Slot arrangement would allow for a slightly stronger attachment point to the metal pipe rotation axis, but it forces you to design the timing belt system on top of the belt. I bought my parts separately so that I could have a "40x20" V-Slot rail laid horizontally instead of the vertical 20x40 arrangement that the OpenBuilds kit suggests using. If you have acquired the OpenBuilds V-Slot kit or bought part that are similar, use the assembly resources from their website as a good guide for assembling the slide. I cut the metal pipe to the length that I needed and drilled a hole through the pipe in the location where I was going to mount the main timing belt pulley. When I tested this, I found that I needed to insert large washers in different locations under the flange to ensure that it was perpendicular.Ĥ. After securing the flange, insert the metal pipe in the ball bearing and check if the pipe is perpendicular to the base. Before securing the flange, you need to insert the slip ring in the 1/2" hole and secure it with wood screws so that the flange and the free-spinning node is facing upwards.ģ. I bored a 1/2" hole in the center of the circle for the slip ring, and drilled 4 other holes for the screws that will secure the flange bearing to the base. Make sure you mark the center of your square before cutting it into a circle.Ģ. I used a jigsaw (before I bought a woodworking router for better cuts) to cut the MDF board into a rough circle and sanded the edges. Any 1/2" thick wood could be used for the base (not necessarily MDF). I used a 1/2" piece of MDF wood to act as a strong, heavy base for the arm mechanism. GPIO pin breakout module with 40-pin ribbon cableġ.31" (or any other dimension) circular tempered glass.1/2" and 1/4" pieces of plywood, birchwood, etc.Any other wood/machine screw necessary for securing components.Large washers or shims (for balancing the flange).Drop in T-nuts (I would suggest definitely getting some M5 T-nuts and any other sizes that you want).4x Larger screws and nuts for securing the flange bearing to the base (I found these at my local hardware store).Any other male/female wires necessary for wiring with the Raspberry Piįor the linear slide mechanism, I found the parts separately on OpenBuilds, but I would suggest using the V-Slot linear actuator kit, since it has all of the parts necessary as well as assembly instructions.DC power jacks (at least 2x male and 2x female connectors).Raspberry Pi (any version with the 40 pin GPIO).
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