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Bubblegum CNC - Proxxon MF70 CNC Conversion Kit

by goopyplastic, published

Bubblegum CNC - Proxxon MF70 CNC Conversion Kit by goopyplastic Nov 5, 2012

Description

Information at https://www.youtube.com/playlist?list=PLYxf6JVpXtyO_PyjGGxkbttEl6JiWM5uO

NOTE: The lower axis is offset .7mm I am not sure if this is specific to my mill or not. If you find that it doesn't fit well let me know and I will upload a neutral version (or if you need a specific offset).

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Hi, I want to convert my KT70 for semi-automatic PCB drilling. I like your design very much. IMHO it is far more sophisticated and rigid than all the other NEMA motor mounts for the KT70 / MF70 I have found so far. In my KT70 there seems to be no horizontal offset in the lower axis - it is perfectly centered. Do you have a neutral version which you could upload? Would save me some refactoring of the STL. Thanks!

Mind sharing the Nema 23 Motor mount plates?

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Hi, I want to convert my KT70 for semi-automatic PCB drilling. I like your design very much. IMHO it is far more sophisticated and rigid than all the other NEMA motor mounts for the KT70 / MF70 I have found so far. In my KT70 there seems to be no horizontal offset in the lower axis - it is perfectly centered. Do you have a neutral version which you could upload? Would save me some refactoring of the STL. Thanks!

I have modified it to accept NEMA 23 motors. There are step by step guides (plenty of images) in my blog (www.elektroquark.com) in Spanish showing how I am configuring my MF 70 with your awesome kit (work in progress). I will use printed flexible couplers too. Thank you very much for this kit.

Mind sharing the Nema 23 Motor mount plates?

Dec 23, 2014 - Modified Dec 23, 2014
ElektroQuark - in reply to Atomist

Of course! You can download modified files from http://www.elektroquark.com/wp/2014/12/17/quark-xxxv-proxxon-mf-70-bubblegum-cnc-introduccion/

This comment has been deleted.
Dec 12, 2014 - Modified Feb 1, 2015

I have no idea what has changed on thingiverse. But it has completed destroyed all formatting I had done on this parts list. I have tried to fix it, but it will not be fixed.

Z Axis -Printed Parts - m70-zlimit m70zplate-626-bearing-lower m70zplate-626-bearing-upper m70zplate-626-plate m70zplate-626-stepper -Hardware- -Bracket Assembly 10x #4 3/4" Self Tapping Counter Sunk Screws 4x #4 1/2" Self Tapping Counter Sunk Screws -Stepper Motor Assembly 4x M3 x 10mm Coarse Thread Socket Cap Screws 4x M3 Washers 2x 626-2RS Bearings(or regular) 1x 4x5x25mm Shaft Coupler(4mm side drilled out to 4.5mm) 1x Dubro #40 Brass Locking Collar (20/16" Drilled 4.5mm -Assembly To Mill 4x M3 20mm Coarse Thread Socket Cap Screws Lower Axis -Printed Parts - mf70lowerplate-626-internal mf70lowerplate-626-internal-mirror mf70lowerplate-626-plate mf70lowerplate-626-plate-mirror mf70lowerplate-626-stepper -Hardware- -Bracket Assembly 10x #4 3/4" Self Tapping Counter Sunk Screws 4x #4 1/2" Self Tapping Counter Sunk Screws -Stepper Motor Assembly 4x M3 x 10mm Coarse Thread Socket Cap Screws 4x M3 Washers 2x 626-2RS Bearings(or regular) 1x 4x5x25mm Shaft Coupler(4mm side drilled out to 4.5mm) 1x Dubro #40 Brass Locking Collar (20/16" Drilled 4.5mm -Assembly To Mill 4x M3 20mm(flexible on length) Self Tapping Button Head Upper Axis -Printed Parts - mf70upperplate-626-internal mf70upperplate-626-plate mf70upperplate-626-plate-unblocked-mirror mf70upperplate-626-stepper -Hardware- -Bracket Assembly 10x #4 3/4" Self Tapping Counter Sunk Screws 4x #4 1/2" Self Tapping Counter Sunk Screws -Stepper Motor Assembly 4x M3 x 10mm Coarse Thread Socket Cap Screws 4x M3 Washers 2x 626-2RS Bearings(or regular) 1x 4x5x25mm Shaft Coupler(4mm side drilled out to 4.5mm) 1x Dubro #40 Brass Locking Collar (20/16" Drilled 4.5mm -Assembly To Mill 4x M3 20mm(flexible on length) Self Tapping Button Head

Total Quantites Of Hardware 30x #4 3/4" Self Tapping Counter Sunk Screws 12x #4 1/2" Self Tapping Counter Sunk Screws 8x M3 20mm(flexible on length) Self Tapping Button Head 6 x 626-2RS Bearings 3x 4x5x25mm Shaft Couplers 4.5mm Drilled out 3x Dubro #40 Brass Locking Collars 3/16" (Drilled out to 4.5mm) 12x M3 x 10mm Coarse Thread Socket Cap Screws(or similar) 12x M3 Washers 6x Omron micro Switch D2F-01FL(or any pin/plunger micro switch)

***Note: You will most likely want some type of glue like gorilla glue and REALLY small self tapping/metal screws for adhering a couple of the plates together, as well as the micro switches to the appropriate places outline in goopyplastic's video.

Alternative Ideas-- The shaft couplers could be substituted with something like this http://www.thingiverse.com/thing:9622

***Note: You will most likely want some type of glue like gorilla glue and REALLY small self tapping/metal screws for adhering a couple of the plates together, as well as the micro switches to the appropriate places outline in goopyplastic's video.

Yet Another Prusa Mendel Z Coupling
by nophead
This comment has been deleted.

Sorry folks, the domain link went bad and I didn't notice. You can find build videos including BOM in the video at my youtube playlist here: https://www.youtube.com/playlist?list=PLYxf6JVpXtyO_PyjGGxkbttEl6JiWM5uOhttps://www.youtube.com/playli...

can you please list all hardware.I have some hard time to find the right bearing and screws thanks

The videos here have the BOM: https://www.youtube.com/playlist?list=PLYxf6JVpXtyO_PyjGGxkbttEl6JiWM5uOhttps://www.youtube.com/playli... Nema 23 would not work with my design as it is.

A very sophisticated design - the proxxon people should hire you... :)

Two questions: A) What material did you use for the pink prototype - resp. what do you recommend for the whole set? PLA, ABS or? B) Why did you decide to also redesign the whole assembly that keeps the bearings and spindles in place? Reduced backlash? a defined position for the endstop switches? Or just fun doing it? ;) Some people just add motor holders ...

TIA for your reply!

a) I used ABS, it shouldn't matter ABS vs. PLA as long as the motors don't get hot. b) the main reason is because the stock endplates are not very strong so you can't tighten the leadscrew nuts very much and this leaves backlash in the system, so yes it is to eliminate backlash (via tightening of the leadscrew nuts).

A) I used ABS but at the time that is what I had, PLA should work fine as well. B) To reduce backlash primarily. The stock plates are not very strong and will deform when the leadscrew nut is tightened. That is a downside of the motor holder conversions although depending on your application the motor holders may work fine.

Thanks. Good analysis of the given construction from your side! Is there any work on FEM analysis of 3Dprinted materials done or under way already? I understand that with the multivariability of the various parameters, this is pretty complex on the first sight. On the second, it could lead to mechanically and morpholically optimized structures - assuming that the material properties are more or less reproducibkle. Apropos - did you measure the accuracy and repeatable reproduciblity of the milling machine? You also rely on a linear characteristic of the spindles. The thread slope can vary considerably, though. Wikthout demanding too much from the simple design - a servo drive with a linear way transducer like the electromagnetic ones from Tico might be suitable to improve the setup further.

Really like your conversion. I've watched all your videos and am printing out the parts now. Could you provide a BOM for all the other hardware? Thank you.

Hi goopyplastic.

We are currently converting the MF70 at our hackspace to CNC using your kit. Very impressed with it, there's zero backlash on the X and Y axes compared to our old conversion.

http://hacman.org.uk/cnc-night/http://hacman.org.uk/cnc-night... is our current status. As far as we can tell, we have the only bubblegumcnc except yours on the entire internet :)

-Bob

I want to build the second bubblegumcnc, please publish a list of parts please!

Thanks

Daniele

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