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Angle Grinder: Reversible, with a Hollow Arbour and a Top Arbour Lock (Turley, US 5,718,621)
Edward Michael Turley · Public domain
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9. Novemba 2026NO
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Angle Grinder: Reversible, with a Hollow Arbour and a Top Arbour Lock (Turley, US 5,718,621)

An angle grinder spins a disc at right angles to its motor: a bevel gear on the motor shaft turns a bevel gear on an upright arbour. E. M. Turley (US 5,718,621, 1998) makes the arbour hollow. A bolt runs down through it into a hexagonal coupling piece that drives the disc and clamps it against the arbour's flange, so the motor can run either way without loosening the disc. To change the disc, a sliding lock piece on top locks the arbour, opens a hole over the bolt head and switches the motor off in one move. Source: E. M. Turley, "Reversible Angle Grinder with Top Arbour Lock", US Patent 5,718,621 (filed 1996, granted 1998). Picture: its Fig. 1.
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Maagizo

1

Read Turley

"The angle grinder according to the preferred embodiment of the invention includes a reversible motor driving a hollow arbour via a right angle bevel gear arrangement. The arbour has a right angle flange at its bottom. The flange abuts against one side of the disk tool."
2

Turn the hollow arbour

Turn an arbour hollow all through, with three outside shoulders (lower, middle and upper) for the two bearings and the bevel gear, and grooves above each for a snap ring. At the bottom, enlarge the bore into a hexagonal recess ending in a right-angle flange. At the top, enlarge the bore so the bolt head sits below the rim, and cut four equally spaced square notches (crenellations) in the rim. Sizes and metal are not given.

Vifaa kwa hatua hii:

Metali isiyojulikanaMetali isiyojulikana1 arbour

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Mashine ya kusaga chumaMashine ya kusaga chuma
Tupa (Tupa ya Mkono)Tupa (Tupa ya Mkono)
Vipimo visivyojulikanaVipimo visivyojulikana
3

Make the coupling piece and bolt

Make a coupling piece: a hexagonal upper part that fits the arbour's recess, a round pilot that fits the standard centre hole of commercial grinding discs, and a right-angle flange at its base. Bore and tap it from the top, closed at the bottom. Make a retaining bolt long enough to run from the arbour's top down into the coupling piece, threaded at its lower end (Fig. 1 draws a socket in its head).

Vifaa kwa hatua hii:

Metali isiyojulikanaMetali isiyojulikana1 coupling piece
Metali isiyojulikanaMetali isiyojulikana1 retaining bolt

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Mashine ya kusaga chumaMashine ya kusaga chuma
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Vipimo visivyojulikanaVipimo visivyojulikana
4

Cut the bevel gears

Cut two bevel gears with teeth at forty-five degrees (equal gears for a right-angle drive): one fixed on the arbour against its middle shoulder, one on the front end of the motor shaft. Tooth count and metal are not given.

Vifaa kwa hatua hii:

Metali isiyojulikanaMetali isiyojulikana2 bevel gears

Zana zinazohitajika:

Mashine ya kusaga chumaMashine ya kusaga chuma
Kikata gia piaKikata gia pia
Vipimo visivyojulikanaVipimo visivyojulikana
5

Assemble the drive

Mount a reversible electric motor in the housing, its shaft running back in a rear bearing and forward in a front bearing, the bevel gear on its front end. Set the arbour upright in two bearings at its lower and upper shoulders, the bevel gears meshing, with snap rings above the bearings and the gear. Drop the bolt down the arbour on a lock washer, fit the coupling piece from below and screw it on. Motor rating, housing material and how the bearings are held are not given.

Vifaa kwa hatua hii:

Mota ya umemeMota ya umeme1 reversible
Fani ya MipiraFani ya Mipira4 vipande
Nyenzo isiyojulikanaNyenzo isiyojulikana1 housing

Zana zinazohitajika:

Seti ya funguo za pembe sitaSeti ya funguo za pembe sita
Njia ya kuunda isiyojulikanaNjia ya kuunda isiyojulikana
Vipimo visivyojulikanaVipimo visivyojulikana
6

Fit the arbour lock

Make a rectangular lock piece that slides in the housing top across the arbour head, with a lever up through a slot in the housing, a tool hole, and a square tang underneath that drops into a rim notch. A spring on its front face holds it back in the running position. Fix a two-contact power switch to its rear so the motor circuit is broken when the piece is slid into the locking position. Cut a hole in the housing top over the bolt head and a slot for the lever.

Vifaa kwa hatua hii:

Metali isiyojulikanaMetali isiyojulikana1 lock piece
SpringiSpringi1 kipande
Swichi ya kuwasha/kuzimaSwichi ya kuwasha/kuzima1 kipande

Zana zinazohitajika:

Mashine ya kusaga chumaMashine ya kusaga chuma
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Tupa (Tupa ya Mkono)Tupa (Tupa ya Mkono)
7

Change a disc

Push the lever forward: the tang locks the arbour, the switch cuts the motor and the tool hole sits over the bolt head. Unscrew the bolt from above with the key and pull the coupling piece; put the new disc on its pilot and screw it back up tight, so the disc is clamped between the arbour flange and the coupling flange. Let the lever spring back to run. Turley: a loose bolt cannot drop the disc, which rattles to warn you to tighten it.

Zana zinazohitajika:

Seti ya funguo za pembe sitaSeti ya funguo za pembe sita

Vifaa

6

Zana Zinazohitajika

10

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