New ATRUMP Milling Machines
In the past the Bridgeport milling machine was a fine piece of iron. Today Atrump has captured the market place for high quality at an affordable price. It's just not possible to be the cheapest cnc machine while retaining a professional level of quality. Our target market for these fine cnc machine tools is shop owners who recognize and appreciate great value in cnc machinery.
Lower Cost Open Bed Mills
Click on photos shown along the right side.
Atrump's model xxFC milling machines
utilize a quill style spindle. Sometimes it is desirable to have one
mill that performs both manual operations and full 3 axis CNC programmable
machining. Smaller models can be delivered with R8 taper or NTS#30 taper
spindle nose. Most models come with a NTS#40 taper spindle as standard.
The head on a FC model machine may resemble the type found on a typical knee
mill, HOWEVER, these machines are built with specially engineered, oversized
castings and quills. The B8FC uses a 7 1/2 horse power spindle motor.
A very nice feature of the Centroid controller is the way it handles
the back gear on a quill type head. Atrump installs a back gear sensor
switch. The control will automatically know when to reverse the spindle
motor between high and low gears. Your M3 "spindle on" command will always work in the clockwise direction
and the programmable spindle speed is recalculated for the different
Atrump's model xxEC machines are built with a 40 taper, machining center type
cartridge spindle. These spindles come with 2 pulley ratios,
normal and high torque. Large diameter cutters like shell mills and face
mills require a greater amount of torque usually at lower speeds. Atrump
mills have provided for this. Hogging steel bases can be handled well
with this model. The 40 taper cartridge type spindle is much more durable
than the quill style. If are planning to place your machine into a production
situation or heavy metal removal the EC version machines are a better
OPEN BED MILLS
(typically in stock)
With Manual quill
Travel X=35" Y=18" Z=20"
Table size 10" X 54"
5 H.P. 40 taper spindle
Travel X=31" Y=16" Z=20"
Table size 10" X 50"
5 H.P. 40 taper spindle
Travel X=41.7" Y=22" Z=24"
Table size 14" X 52"
6 H.P. 40 Taper spindle
Travel X=50" Y=22" Z=24"
Table size 18" X 56.7"
10 H.P. 40 taper spindle
Other sizes available in
6 to 8 weeks. Built per your specifications.
DC Vs. AC Servo Motors
Often the question comes up:
I order my machine with DC servo motors or the new AC brushless servos?"
The choice is easier than you might think.
- DC servo motors have
been around for decades. They are well proven and reliable. Out of
a few hundred customer machines I don't sell more than one or two
replacement DC type servo motors each year.
- These motors have more
torque at feed rate speeds than the same sized AC servo motor.
- Finally the cost of these
simple motors is considerably less than a properly sized AC brushless
AC brushless motors do have their place in modern machine
- Ac servo motors
provide higher working speeds. This gives your machine quicker acceleration
and faster rapid speeds. A feature that can be important in
time sensitive applications.
- The costs for AC
brushless motors become much closer to that of the DC motor in the
higher output sizes.
- The overall size and
weight of an AC brushless motor is considerably less than the same
sized DC type servo.
Larger Atrump mills
will come with AC brushless motors as standard equipment. The machines
listed on this page all come standard with 29"/lbs. or 40 "/lbs. DC servo
motors. If higher rapid speeds are justified for your application then
we will build your new Atrump milling machine with AC brushless servos.
4th axis coordinated positioning is handled inside your main G-code program. No outside programming box is needed.
Of course if you already own a rotary table with a programming box your Centroid control can handle that too.
View 4th axis web page |
Download rotary tables .pdf file.
directly or Email us at email@example.com
Rotary tables literature.pdf file is just over 4Mb
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