Latest update
10-04-2010
- SIEG
- 3
phase steppers
-
- a router
Project 1 The Sieg conversion.
The Sieg mini mill is sold in Holland as Black & Red and asks € 500.-. The same machine is sold under the names Grizzly, Homier, Micromark , Alpha, Bernardo. The Sieg X2 has a little brother X1 and a bigger one the X3 and X3 super
Cheap rolled trapezium thread 16 x 4 mm combined with PETP or POM nuts were applied.
How to get a suitable nut? Machining such small nuts in the conventional lathe is a hard job. The only way is to make a tap.
Trapezium comes in cheap meters and I took 35 centimeters for the tap.
My idea was to make a long cone. The core diameter of 16 x 4 is about 11 mm and from there to 16 mm with
a
top slide angle of about 1 degree, a flow is made from 150 mm. If you want
to copy it, take my advice: don't use
widia, but HSS at slow speed in cutting the fragile spindle off.
After that, 3 flutes were ground with a normal thin disc in the mill. The
cutting edge is 84 degrees.
Believe me, the thing is sharp after finishing with a fine
stone and making a nut in polymer is quite easy. Don't make narrow
flutes, the plactic must go anywhere.
may 3rd 2005
The Drivers
The well known Thorsten Ostermann www.ostermann-net.de designed 4 Amp drivers and a break out board. I chose these for my 2 Nm steppers, and they are performing quit well. My connection in Holland for these is www.damencnc.nl
___________________________
The magic of 3 phase steppers,
New drivers have been made for the KT60KM06 3 phase steppermotors from Japan Servo. The steppers possess only 3 wires and are three phase with a star coil configuration. A driver is based on the HA13532 and the bridge SLA6023.
These motors are salvaged from copiers. The difference between the commonly
used 2 phase steppers is not quite obvious for my application. The specs of
the manufacturer speak of more torque at higher speed. My statement is
only, that they are working with the
apparant low holding torque of 0,5 Nm and in half step highly accurate with 1200 steps/rev.
The set up of the measurement of the torque and the trial for inductive sensors as shown below.
Project 2 A Router
This router was a platform of exercise for all aspects of building and design, and managing budget.
Specs &steps
Workspace 250 x 300 mm with a Z of 160 mm
Strategic:
Most routers are moving gantry ones and have a fixed table.
However, for the
small workspace in this case a moving table is suitable. So there is a
steady bridge.
And:
-
take a suitable handmill
- fix the Z- axis travel and the altitude of the saddle above the
table, create a imaginary"cube"for the objects to be milled on
the table. Watch the height of vices etcetera, and the length of milling
tools.
- look at the saddle width
- what should be the effective way of Y, and take a little
oversize
- dimensions of the frame of the machine
- determination of the X travel
- length dimension of the frame
- tuning in the table dimensions, think about the clamps, bolts
and stairblocks
Project 3. The MINIminimill
This project is based on the X1 from Sieg Corporation. The crosstable has 0,5 Nm Japan Servo Nema23 motors.
Project 4 The Lathemasters conversion
Last year I found a crippled lathe in Buitelaars store in Waddinxveen. Only €350.- and no questions. I never never have any questions... I have plans. :))The conversion has started lately. Changing the X/Y-axis is no problem. The main spindle however, should be a step/ direction controlled axis and not only RPM controlled.
March2007: mechanics are done. I have changed to electronics.
Yet Another anti Backlash Solution
Yabs! This concept is very simple and the solution is
acting alike a collet chuck. The 40 mm long POM nuts are
incised over three quarters of their length with 1, 2 or 3 kerfs.
The 2, 3 or 4 members are kept on their free end by an O-ring with an adequate
tension enclosing the thread. Thus a dynamic fill of the trapezium
thread will be
achieved. Several pilots learned, that with the right dimensions of the
screw, nut and O-ring, major forces can be transferred. There are truly
two nuts: a static and a dynamic one. I'm looking for the right
dimensions yet. And a first trial with an pneumatic YABS! is almost
finished. Anyway, the kick is to save
much money on ball screws. They are open source, so go ahead!
The First and only Cross Table
with
in the world.
This is the first attempt to get a full functional mill
at a rock bottom price. Black & Red has upgraded the X1 minimill
with a larger table and the former tables are selling off. The base of
the table has an extension for the column. From there fantasy must take
over.
The first table is equiped with common Nema 23 |Japan Servo's of 0.5 Nm. Two others will get the 3 phase 60 x60 mm Japan Servo's with high resolution 1200 steps/rev in half step. It seems that these motors are more powerfull than expected, anyway they have an 8 mm shaft.
YABS in different forms
