MPCNC Primo J Bosch Colt 1HP Mount

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Updated version... tested and MPCNC Primo approved (unofficially;) )! I removed the old STL and replaced it with new versions. Both newer versions have a shortened clamp nose to eliminate interference with the home corner parts on a Primo.

I uploaded a second stl with a vacuum flange and matching modified brush holder, intended to be used with chschmit's CNC vacuum assembly. You can find the rest of the required parts for the vacuum attachment here: https://www.thingiverse.com/thing:3131476

Note that I made a small update to the vac flange router mount to beef up the plastic around where the flange bolts go. So if you happened to print the earlier version without the beefed up bolt holes and it has cracked, you may want to reprint an updated version (it will not crack even if you bump it fairly hard). I uploaded a photo showing the difference between the old and new bolt hole areas, which can be used for reference.

I remixed the original "Clamp_Lower_Brush.stl" part to accept M3 nuts for non-glued assembly. This also allows removal for easier access to the spindle nut. Simply push 2 nuts in from the sides, and bolt it to the router flange with some M3 bolts (preferably with washers).

I also recently added a 1pc print for the vacuum clamp and plenum. I found glue inadequate to hold the original design together. So I made the whole deal 1pc without really messing with any of the dimensions. This is a stop gap until I can redesign a lower profile plenum (for lower reduction of workspace).

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There are some 2 piece designs to mount the 1hp Bosch Colt router on the MPCNC Primo/Burly, but I wanted a stiffer 1pc design. So I drew this this tool mount for my MPCNC Primo J (25.4mm). It is intended to mount to the MPCNC like the original Burly/525 tool mount, but no is drilling required:

https://www.thingiverse.com/thing:1671517

I resized the pipe bolt holes to M5 clearance, and increased the counterbores to 9mm diameter to fit the M5x30 allen bolts I use with my Primo nut traps. The router clamp uses 2@ M5x30 allen bolts and M5 nylock nuts. The clamp nuts are captured for convenience.

I didn't use a sloping top like many Colt mounts out there. The flat top allows the router to be rotated as needed, which can help with some scenarios where router power cable clearance or location may be an issue. The flat top also adds convenience when it comes to designing adapters to quickly swap in other common MPCNC tools like drag knifes, lasers, etc. The spindle lock access hole lines up with the button only if the router is rotated to the correct orientation.

Note the power cord on the Colt exits to the side, which is generally problematic for the MPCNC design. It is usually aligned with either the X or Y axis to clear the trucks when homing, and even then if you have a sufficiently tall build, the cord may still crash into the side rails when homing (depending on the z height when homing). So unless you modify the cord strain relief, you must always pay attention to z height before homing on a Colt equipped MPCNC!

I printed in PETG for heat resistance and stiffness. PLA is not wise for a cnc motor holder. I setup my slicer to use 4 walls, 8 tops/bottoms, and 45% infill on all my printed tools... but up it to 70% infill in for this part as you will want the extra stiffness. Build plate only supports are needed. The part is already oriented ready to print. Flipping it over will increase support material and print time, and make the more visible top surface look nasty.

Print Settings

Rafts:

No

Supports:

Resolution:

0.2

Infill:

Filament: na PETG

Notes:

Category: Machine Tools