Candy Controls: HDD Harmonic Differential

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	Harmonic Differential

	Principle of Operation

	Technical Data

	Performance Information

	Mounting/Installation

	Ordering/Dimensions

	CAD Files

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Harmonic Differential HDD

When ordering an HDD, it is important to:

1. Properly size the HDD unit based on required torque and operating speeds. The "E" Stop or maximum torque condition must be considered when sizing the unit.

2. Choose the appropriate control shaft ratio for the application.

3. Select the mounting method that best suits the application. Decision must include machine shaft diameter and desired bushing style.

Size	A*	B*	C	D	E	F*	G	H	J	K	L	M	N	P*
HDD 20	7.06	1.417	4.00	2.875	1.875	1.10	1.00	3.24	.38	0.12	.60	2.16	0.937	2.10
HDD 25	8.11	1.890	4.50	3.313	2.250	1.30	1.50	3.37	.50	0.12	.69	2.76	1.375	2.40
HDD 32	8.77	2.362	5.63	3.875	2.750	1.30	1.63	3.83	.50	0.13	.63	3.74	1.875	2.80
HDD 40	10.58	2.756	6.88	4.750	3.500	1.38	2.00	5.19	.50	0.13	.63	3.74	1.875	3.30
HDD 50	12.55	3.150	8.00	6.000	4.250	1.83	2.31	6.09	.50	0.13	.44	4.50	2.500	4.00
HDDX 50	13.17	2.756	8.00	5.250	3.500	1.38	2.25	7.44	.50	0.22	.38	4.50	2.500	3.80
HDDX 60	18.04	3.740	10.00	7.500	5.000	2.23	3.00	10.06	.75	0.13	.63	6.25	3.000	5.80

*Dimensions A, B, F, and P refer to the largest possible bore and shrink-disc bushing available for
each HDD size. Please consult the factory for alternative bore sizes and mounting configurations.

Size	R	S	T (Square)	W-BCD	Y-BCD	Max Radial Load
HDD 20	1.00	3.75	0.094 X .50Lg	(6) 1/4-20 on 3.438 BCD	(3) 6-32 on 0.750 BCD	640 lbs
HDD 25	1.13	.437	0.094 X .63Lg	(6) 1/4-20 on 3.906 BCD	(3) 8-32 on 1.125 BCD	970 lbs.
HDD 32	1.25	.500	0.125X .88Lg	(6) 5/16-18 on 4.750 BCD	(3) 1/4-20 on 1.500 BCD	1330 lbs.
HDD 40	1.25	.500	0.125 X .88Lg	(6) 3/8-16 on 5.813 BCD	(3) 1/4-20 on 1.500 BCD	2460 lbs.
HDD 50	1.75	.750	0.188 X 1.13Lg	(6) 3/8-16 on 7.000 BCD	(3) 5/16-18 on 1.875 BCD	3710 lbs.
HDDX 50	1.50	.750	0.188 X 1.13Lg	(6) 3/8-16 on 6.750 BCD	(3) 5/16-18 on 1.875 BCD	3710 lbs.
HDDX 65	2.00	1.000	0.250 X 1.50Lg	(6) 5/8-11 on 8.750 BCD	(3) 3/8-16 on 2.250 BCD	6200 lbs.

All dimensions are in inches and may change depending on mounting configurations.
All dimensions and specifications are subject to change without notice.
Please consult the factory for layout drawings specific to your application.
Caution: Rotating equipment must be guarded per OSHA
specifications and recommendations.

The Candy Harmonic Differential, HDD series is available on various design formats. Click this link or Call Candy today to receive your FREE copy of Auto CAD, DXF or Personal Designer files.

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