UM 400 – HobbyMekanik

13 december, 202027 augusti, 2022

Fitting a chuck to an adapter plate, for my Schaublin 102.

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28 september, 202028 september, 2020

Making a jig/fixture for brazing quills

I’ve stratet to build my own jig for brazing quills for bicycles. I’m close to finished and so far all material used are scrap material I got as a bonus when buying a couple of steel benches for my and a friends workshops.

7 januari, 20197 januari, 2019

UM 400 as a mill

Here I’m rotating a rotary table by hand when milling in aluminium.

8 december, 20187 januari, 2019

UM 400 as lathe

You can hear there is a little rattle in the noise and it comes from the cogs when using the planetary gear to decrease the motors rpm from 2910/1470 rpm to here approximately 775 rpm (slowest speed is 390 rpm). The carbide insert is a little dull as you can hear from the sound when cutting, and therefore the cut depth is only 0.2mm.

4 september, 201813 september, 2018

UM 400 motor rebuild, part 2

If you want just to replace the bearings you do not need to open up the electrical switch. If you need to open up the the electrical switch make sure all cables go free from the rotor when you put it together again. Also make sure the internal cables do not push to hard on the motors copper windings.

New bearings…

Assembly starts

The rotor looks really nice

3 september, 201813 september, 2018

UM 400 motor rebuild, part 1

Here are some pictures from my UM 400 motor rebuild. Both the berings in the motor and in the planetary gear needed to be replaced. The bearings in the motor are two SKF 6203-Z and in the planetary gear two SKF 6005-Z. I will buy new bearings at Momentum tomorrow, and continue the assembly.

A previous owner have had the machine in a cold and humid environment. It shows even on the inside of the motor.

Type plate on the engine