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Rivett No. 4 Lathe (later called the 504)
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The "Cutter Milling and Gear Cutting Attachment" or "Slide Rest and Milling Attachment" as it was also called, was the same as the unit made for the 8 inch-precision lathe (early 608).
The cross feed was 4 inches and the vertical and angular movement 5 inches. Cutters up to a maximum diameter of 3 inches could be manufactured by the attachment, except ball cutters which could be generated in the range of 1/8 inch to 3 inches in diameter.
Index plates were supplied having 45, 56, 60, 64, 72, 80, 84 and 100 indents with others available to special order.
Rivett were inordinately proud of their lathes' ability to generate cutters and claimed that, even though they had milling machines of the very best kind in their workshops, nearly all their special angle cutters were made on either their No. 4 or 8-inch precision lathes.

The "Screwcutting and Power Taper-turning Attachment" with a feed to the top slide was also an option on the No. 3 and 8-inch Precision (608) lathes.
The slide had a travel of 4 inches and could turn tapers of up to 60 degrees.

The No. 4 lathe is shown here with the Forming Slide, 6-station Turret Attachment and quick-action collet closer - items which were commonly available for all models in the Rivett range.

The No. 4 lathe shown on what Rivett described as "Standard Brown and Sharpe Bench Legs." Mounted on the lathe bed is the beautiful  "Slide Grinding Attachment" shown in detail below. When this device was used at an angle a special compensator guided the drive belt and aligned its run to pass over the spindle pulley in more or less a straight line. The device is partially hidden behind the lathe in the picture above - but clearly illustrated below

The "Slide Grinding Attachment", finished with scraped and polished surfaces in the traditional Rivett, was designed to slot into the place normally occupied by the compound slide rest. Two heads were supplied, one for internal and one for external work. When the head was set at an angle its drive rope was aligned by the special unit illustrated below. This unit was also made to fit the 8-inch Precision lathe - the early version of the 608

When the grinding head was set at an angle, the device illustrated compensated for the twist in the belt and applied it to the cutter pulley at the correct angle.

The "Releaving Attachment", a common fitting on quality lathes in the early part of the century, was designed to do under power what had previously often been done by hand - to accurately relieve (or back off) the teeth of taps, cutters, hobs and milling cutters.
The device took its power from a gear on the end of the headstock spindle, through interchangeable gears on a quadrant, two knuckle joints and a telescopic shaft, to the actuating mechanism underneath the slide rest.
The device imparted an oscillating motion to the slide, with a cam providing the forward action and a spring the return thrust. The amount of relief needed could be adjusted by turning a wheel at the front of the slide

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Rivett No. 4 Lathe (later called the 504)
email: tony@lathes.co.uk
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