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Call us at 905-624-5536
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H.H. Roberts Machinery Limited
1324 Matheson Blvd E., Mississauga, Ontario, Canada. L4W-2Z7, Fax 905-624-9065
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HH Roberts / Topwell TW-32-Q
Bed Style CNC Mill
with tilting quill type head
travels 32" x 20" x 20",   7 1/2 to 15 Hp,
6,000 rpm.
manual hand wheels on X and Y
quill lever on head

October 2015
In stock with the new Acu-Rite G2 CNC.



All these models are available with Anilam, Heidenhain, Fanuc and Mitsubishi CNC




Below our TW-32-Q at the Toronto Machine Tool Show October 2015
On the Heidenhain booth

 
The TW-32-Q is our most popular model  This machine features handwheels on X and Y axes and a 7 1/2 Hp quill head with traditional lever and geared power feed.
The major advantages of this model over the knee mill versions are:

1) a 20" Z axis travel on the column plus 5"
     quill travel on the tilting head.

2) a 20" Y axis travel

3) more stable platform for the table and saddle

4) increased load capacity on the table.

Click here for more detailed specifications

Download our complete CNC bed mill catalog in PDF format: CLICK HERE
Topwell TW32Q cnc bed mill
The two photos show the same model with 2 different control mounting options.  Above the control is overarm mounted.  This has the advantage of keeping floor space a little more open.
The machine on the left has the machine mounted on a rigid arm. On this the work height is much more comfortable for shop floor programming. It is mounted to the left to keep the traditional operator's position open so the table handwheeel can be operated by the right hand and the cross feed with the left hand.  The machine to the left has and optional multifunction MPG with an E-stop, axis select, jog rate selector, a coolant override toggle and a cycle run/ fee hold toggle.

This machine can be offered with Anilam controls or Heidenhain. 

The chip pan, side splash guards, coolant pump, telescopic steel covers, power draw bar and work light are all standard.

The spindle can accept either standard # 40 tools, CAT-V 40 or BT-40 tools.

We also offer a manual machine with the same machine frame, ballscrews, and CNC servo axis feed system and and integral digital readout.  Because the feed system uses the same series CNC motors and amplifiers, a future upgrade to a full CNC is easy and economical.

We use CDS DC Servo drivers on these machines as standard equipment.

Click here to see the manual model

 

TW-32-Q

X axis travel
32" opt 28"
Y axis travel
20"
Z axis travel
20"
Quill travel
5"
Quill power feeds
3
Table size
50" x 12"
Spindle C/L to column
22" optionally 25"
Spindle nose to table
23"
Saddle width
22"
Tooling
Cat-V40, BT-40 or NMTBA-40
Tool clamping standard
pneumatic power draw bar
Spindle bearing ID
50 mm
Spindle power *
7 1/2 Hp standard, optionally 12 or 15 Hp.
Spindle speeds standard
direct drive 100 to 6,000 or 75 to 4000
Spindle speeds optional
Back geared, Low 15 to 750  ---  High 100 to 6,000 rpm
Rapid traverse
250 IPM
Axis motor torque - cont.
stardard DC 3.1 NM optional 4.5 NM or Yaskawa AC 5.3 NM
Main power supply
230/3/60 optionally 220/1/60 or 460/3/60
Aprroximate weight (lbs)
4,450
Floor space L-R x F-B
97" x 102"
opt 75" x 102"
Max. height in operation
101"

With Handwheels or Without ??? Many customers originally want handwheels on a machine like this.  Giving up the ability to grab the handwheel is sometimes a difficult mental thing to adjust to.  Very few applications can be done as well with handwheels as under CNC control. So, why not ?
The electronic handwheels ( sometimes called MPG's ) give you better control than the mechanical handwheel. To fit handwheels economically the table saddle construction must be similar to the familiar Bridgeport arrangement. This means the saddle is narrower because the X axis handwheel will hit the side of the saddle.  A narrow saddle is needed to give as much X axis travel as possible.  The saddle support for the table suffers, especially near either end of the stroke where the table extends a long way. Another is that is not so obvious is that the economical way to construct the casting holding the X and Y axis ballscrew nuts, is on a common yoke, again like a Bridgeport. This give pretty good support the the X axis nut but the Y axis nut is suspended several inches lower, down between the Y axis slideways.  As movements or cutting loads are applied, this extension permits a significant and measureable flex. In heavy cutting it results in chatter between the saddle and knee.You can check this yourself on any Bridgeport type mill.  Set up a heavy cut and place your finger just where the saddle meets the cross slide. It will surprise you how much movement there is. Furthermore, the handwheels are never balanced well and at high rpm during rapid traverse, cause vibration, which means we must restrict the rapid traverse rate to about 300 rpm to avoid the vibration. The solution for both the support issue and the ballscrew nut issue is to built the machine with the same table / saddle design as modern machining centers. The saddle is very wide and gives excellent support to the table. The X and Y ballscrew nuts are mounted independently with minimal extension.   The negative side, you can't put a handwheel on the end of the X axis screw, like a Bridgeport. Another solution is to build the machine like a machining center and drive the X axis screw through a 90 degree bevel gear arrangement. We recommend that you seriously consider our TW-31, with virtually the same capacity as the above TW-32, or our larger TW-40 which uses the 90 degree drive for the versions with handwheels.