Proxxon MF70 modification. High torque transmission (Part 1)

One more upgrade of my Proxxon MF70 is coming. This time increase a torque and reduce rotation speed.

[@Laura_Battleship_Row]

Why not add an electronic speed controller, lower speed same current.

[@isidoromaich7226]

Awesome project! your FrankenProxxon is going to have new powers :) Have a happy new year!

[@zhadlun]

Happy New Year!

[@Telectronics]

Happy New Year !

[@Mikesmeyer88]

What's a more versatile machine do you think? A lathe or mill? I think you can basically do both on each machine but each have there limits. I'm looking to buy one now I'm thinking milling machine for what I need but they all seem to need upgrades or aren't available. If anyone has one in the US, benchtop mills I'm looking. Harbor freight only has a couple lathes and I think by the time I upgrade everything if it actually works ill be in it for what a nice benchtop mill is.

[@zhadlun]

You could not really replace a tasks you could do on a lathe with a milling machine. And opposite. If you go for a bit bigger machine, very likely you could work without any upgrades.

[@paultrimble9390]

Really nice I like the proxxon stuff. But don't see it lot here USA. Unless it's Internet. Not n lot big box stores. I have real nice almost new old stock DB 200. It has mill column and all original stuff that main lathe/mill combo came with wooden box to. It belong to a dentist estate sale. It's one of early models heavy with one big x bottom casting well I like ur video going be checking them out. Stay safe from ur ole hillbilly buddy. Oh I have proxxon m70 cross slide table nice got good deal on it but small side not super Ridgid but for what it is it's nice.

[@Mikesmeyer88]

Even harbor freight is out of there milling machines, not sure if they have lathes anymore. Of course as soon as I start seriously looking there hard to find, like 3 years ago they were all over for cheap. Seems like every machine now needs a ton of upgrades or your spending too much. There all from China so I might just find a guy there to send me one.

[@Telectronics]

Yes and sometimes you are so lucky that it´s even made flawless enough to work with it out of the box. I got a lathe from china 7 by 14 for 600 dollars and it was even made with steel gears. 👌

[@derkarhu5079]

i wondered if you have your motor with speed feedback/servo mode? i had an idea for gearing:too late, but, i thought that you could take motor and sun/planet gear from a 'scrapped' cordless drill, or, just the gearing, to give a nice speed reduction? if you took the transmission, complete, you might even have high/low range selection, low enough speed even for threading, or...

[@zhadlun]

I was thinking about planetary gearbox. But decided to go just with adding of 2 gears.

[@derkarhu5079]

okey dokey, you're the builder! happy and healthy 2023!

[@zhadlun]

Happy New Year!

[@Telectronics]

Nice project ! I have a question. I have bought a spindle motor with 24000 rpm and 1,5kw do you think I can lower down the speed with a GT2 belt or is the speed to fast for it to handle ? I think 24000 rpm is too much for milling steel I guess. I wanted to divide the speed by 3.

[@sinadaneshkhah8537]

Of course you can

[@sinadaneshkhah8537]

If you read alitl about pouly and mathematic about this you will andrstand and you will see easily you can do

[@Telectronics]

Thank you for your answer 👍

[@Mikesmeyer88]

I wondered that too. I think you could use a speed control if some kind. I think at a lower rpm with more power it would cut fine.

[@Telectronics]

Yes I will implement a vfd because it´s basically a 3 phase bldc motor that I have only made for rectified 230v. The RC type bldc motors are made for lower voltages therefor maybe I don´t even need a belt because the motor is huge with it´s 1500w rating. I have to try it.😄

[@noviceartisan]

Wow, love the concept, very well thought out! You're running out of space fast in there haha :) I'm planning to upgrade mine via the lazy a2212 soon, as a stop-gap upgrade until I can decide on the best upgrade, yours is coming out very much on top. as you keep the machine looking kinda stock :)