Scrawl saw install#
Scrawl saw software#
Scrawl saw professional#

This means I have to enter (desired spiral length in mm) times 2 into the software. For reasons having to do with very low feed rates in GRBL, I choose to use half of that, i.e. My system calibrated at 395.062 steps/mm. Start with a GRBL parameter of $100 = 400 (steps/mm), then tweak this value based on actual movement measurements.

Scrawl saw software#

See below for software and hardware settings. This would also be a good time to calibrate the x-axis stepper motor (linear actuator) settings.

Run the linear actuator back and forth to check that everything moves properly.

Also use a 1/8 ' spacer between the actuator C-beam and the mounting plates for clearance. To do this put the linear actuator onto a flat surface and use card-stock to lift the assemblies slightly off the surface - for clearance. Mount the headstock and tailstock assemblies to the V-Slot extrusions on the plywood sled with M5 screws and Tee-nuts.

1/4' coupling and #2 Phillips head tip, shortened to fit coupling or shape the end of the bolt to a Phillips head.

2.5' 1/4'-20 machine bolt, washers, and nuts.

Four each of M5 - 65mm screws, 40mm aluminum spacer, nylon locknut.

Attached to the 1/4' bolt is a coupling and Phillips head tip. I am using 1/4' by 3/8' bronze machine bushings instead of bearings as the rotational speeds are very slow. If you don't have access to a 3D printer you can redesign the headstock assembly with a belt and pulley system.ġ/4'-20 threaded rod (or bolt), washers, and nuts are used for the mounting axles for the dowel. The other gear has a flat in the 1/4' hole to fit the stepper motor axle. One gear has a recess to retain a 1/4' hex nut. Specs are 20 teeth, 1.5' pitch diameter, 1/2' thick, 1/4' axle hole. The two herringbone helical gears were 3D printed. If you want to cut shorter lengths of spirals you can always move the second V-Slot extrusion and tailstock assembly to a new location on the plywood sled. The tailstock 'dead center' screw can be adjusted by about +/- 0.75 inch, see step 6. These dimensions allow for up to 14 inch long spirals.

Scrawl saw install#

Install a second identical V-Slot extrusion on the other end of the plywood sled. The V-Slot extrusion should be perpendicular to the linear actuator when installed. Then attach the V-Slot extrusion to the plywood sled with #8 wood screws. Check to see that the corner connectors line up with the 1/8' pilot holes on the plywood sled. The corner connectors should be mounted 100 mm and 160 mm from the end of the extrusion as shown in the pictures. Mount four corner connectors with M5 - 8mm low-profile screws and Tee-nuts to a 10' long V-Slot 20x40 extrusion. The two gantry plates and the plywood piece form a sled for moving the dowel-turning assemblies along the actuator.Īttached to the plywood sled is a motor mount assembly to turn the dowel to be cut while the gantry moves forward. The plywood strip is attached to the two gantry plates with 15mm long low-profile M5 screws. The holes are as follows: (1) 1/2' diameter shallow recess, drilled 3 mm deep, drilled with a Forstner bit, (2) 7/32' (5 mm) hole drilled through, (3) 1/8' pilot hole 1/4' deep for #8 wood screws. On each end drill a hole pattern as shown in the pictures.

Don't use thicker plywood or the jig won't fit under the scroll saw. Prepare a 3' wide by 18' long piece of 1/2' thick plywood. Install this gantry plate in the linear actuator C-beam and check that it can move freely. This second gantry is identical to the first one except it is not attached to the lead screw. See steps below for the electronics and software I use.Īssemble a second gantry plate without an anti-backlash nut block. I recommend to assemble and test the linear actuator first before installing any additional components. Just follow the instruction video from OpenBuilds. The linear actuator is a pretty straightforward and easy build. Scroll saw, table saw, drill, 1/2' Forstner drill bit, 7/32' (5mm) and 1/8' drill bits, Helpful: laser cutter, 3D printers

1/2' plywood, 1/4' acrylic sheet, #8 wood screws, 3D printed gears, 3D printed hold-down clamps, 1/4'-20 bolts or threaded rod, nuts, and washers, Phillips head bit.

Scroll Saw Blades: Olson #2 and #4 Spiral Blades,.

Linear actuator, cables, metric screws and nuts, spacers, corner connectors, V-slot extrusions, 2nd gantry assembly, NEMA 23 stepper motorsĪrduino, CNC shield, stepper motor drivers, 24V power supply

Scrawl saw professional#

I have no financial or professional relationship to any vendor mentioned. Other companies offer similar parts and components, so use your preferred vendors. The CNC parts I used were purchased from Openbuilds and Zyltech.