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H.H. Roberts Machinery Limited
1324 Matheson Blvd E., Mississauga, Ontario, Canada. L4W-2Z7
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Milling Machine Heads 5 to 15 Hp.
Available for 220/1/60, 220/3/60 or 460/3/60 power supply
and can be interfaced to most CNC controls for programmable spindle speeds

This series of heavy heads will not fit the ram of a Bridgeport or the Taiwan made clones.  It can be adapted to heavier mills or special machines.  
  The included electonics cabinet can be mounted on the side or back of the the machine.  The head is fully wired and ready to go.
The back geared heads are most popular because they deliver much more torque at low rpm.
Top speed is 6,000 RPM.

CAT-V-40, BT-40

These heads are ideal for upgrading quill type CNC machines because they can be controlled by most CNCs. We use the same vector drives on our CNC mills and machining centres   They can be configured for CNC control of spindle speeds.

E stop buttons are now standard as shown on the picture.
We now install a circuit to shut down the fan on the inverter motor when the spindle is not running to help a quieter shop environment.

Click here to download the heads catalog.

Click here to download the mounting drawing of the
# 4 series heads for Bridgeports and clones.


Click here to download the drawing of the head mount for the heavy 5 / 7-1/2 Hp heads

Showing the HH Roberts replacement milling head on a old Bridgeport milling machine
GL series is gearless vector drive
RG series is back geared

electronics cabinet for replacement milling head, closed
Cabinet mounted on the side of the column
electronics cabinet for replacement milling head, open
Showing a typical electronics cabinet with cooling fan and air filter,
relay, and inverter drive.

All connections to the head are done.  You just need to mount the head on the side or back of the column and have you electrician bring power into the cabinet.


This is the 5 to 7-1/2 Hp head suitable for fitting to our Topwel, some Hurco, Webb and Kent machines.  It is pictured with an Amercian made Hi-Torque power draw bar.

Back geared head  15 to 750 rpm and 100 to 6,000 rpm
Showing the heavy 7 1/2 Hp milling head

Parts diagram for the HH Roberts Milling head This diagram shows the moving parts in the top half of the GL head.  It is in fact a lot like today's modern machining centers with the drive train consisting of

1) the motor shaft and pulley
2) the drive belt
3) the spindle pulley and splined coupling
4) The spindle itself ( not shown ) There are about 85 fewer moving parts.

Maintenance is near zero and is normally only a replacement of the timing belt after years of service.

The RG verson of the head has a back gear for very high torque at low speeds.

replacement milling machine heads for Bridgeport type machines
A shipment of milling heads received into our shop for preparation to sell.

adaptor Drawings and Photos
Bridgeport sized head
5GL #40 taper head
dimensioned drawing
dimensioned drawing
photo #1
photo #1
photo #2
photo #2

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