Expanding Collets for 5C, 16C & 3J spindles - ROVI Products Inc.

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Rovi, the Leader in Internal Workholding!

Rovi Expanding Collets are now available for Purchase Online!


Mini Collets, -26 &-2 for bore diameters of.065"-2" (5C) (16C) (3J)	-4 Collets for bore diameters of .500" - 6" (5C) (16C) (3J)	-8 Heavy Duty for bore diameters of .750" - 6 (16C) (3J)

EXPANDING COLLET ASSEMBLY - YouTube
EXPANDING COLLET MACHINING PART 1 - YouTube
EXPANDING COLLET MACHINING PART 2 - YouTube

DOWN LOAD COMPLETE EXPANDING COLLET IN PDF

Instruction Sheet

Mini Collet Instructions

Price List

ROVI Products manufactures a line of internal expanding collets to fit 5C, 3J and 16C spindles, capable of holding on bores ranging anywhere from .065" to 6" in diameter. Our system is composed of three parts: a hardened and ground sleeve to insure accuracy; a rod assembly which consists of the threaded pull rod, 5C collet nut, lock nut and expanding screw, and the machineable expanding collet. Unlike other designs, our expanding collets have a taper on the shank that locks into the sleeve creating a very rigid collet which in turn gives you better concentricity. All ROVI collets are machineable and completely consumable (.0005" TIR is easily held on production runs and holding .0002 TIR is not uncommon). ROVI collets save time, labor and cost because they can be remachined for many different jobs. When the collet has been consumed or needs to be replaced, simply remove existing collet from the sleeve and insert new collet. It is not necessary to purchase the sleeve and rod assembly for every new collet as other manufacturers may require.

The ROVI mini collet is a unique design which allows this collet to hold on bore diameters from.250" - .065". The mini collet is available in three different chucking lengths: 1/4", 9/16", and 3/4", all with a diameter of 7/16". In addition, a shoulder on the major diameter of this collet allows use of a turning ring for ease of machining.

Our heavy duty collet line for 16C and 3J spindles is capable of holding on bores of.750" - 6" in diameter. These collets are of great benefit, due to the larger taper of the collet and the expanding screw when used on machines which have a lot of pressure generated by hydraulic closers. The design of this system is the same as our standard one.

We also manufacture special collets to your specifications. Please do not hesitate to call us with any questions you may have. ROVI has been in business since 1965 and we are very proficient in the workholding field.

5C EXPANDING MINI COLLETS for Internal Chucking in Bores of .065" - .250"

ROVI Products, Inc. offers an Expanding Mini Collet capable of holding on bores of .065" - .250" in diameter. They are not recommended for use on bores larger than .250" Those parts should be held on the regular ROVI Expanding Collets.

The ROVI Mini Master is essentially a modified 1" ROVI Expanding Collet, which has been machined down and ground to very close tolerances. After assembling the Mini Master with the Sleeve and Rod Assembly, it becomes a carrier for the Mini Collet, and expands from the inside. This permits full use of the front part of the Mini Collet allowing it to be machined to very small diameters without interference of an expanding screw.

Instructions for Assembly of 5C Mini Collets

Clean taper of Mini Master and inside taper of Sleeve and drive Mini Master securely into Sleeve.
Insert Rod Assembly through rear of Sleeve into Mini Master.
Insert Expanding Screw through front of Mini Master into Rod Assembly and bottom screw into Threaded Rod. Hand tighten only until Step 5.
Loosen Lock Nut and adjust Collet Nut so Rod Assembly will travel approximately 1/8" to 3/16"
Tighten Lock Nut and tighten Expanding Screw securely so neither will loosen itself. Be sure to tighten Lock Nut first and then the Expanding Screw.
Slide Mini Collet over Mini Master. Line up slots on Mini Collet with those of Mini Master and lock tight with Locking Collar.
Insert assembled unit into machine. Adjust Collet closer until Collet expands slightly and machine to desired size. Chucking length ordinarily should not be turned back more than 1½ times its diameter.
To disassemble, remove Locking Collar, slide Mini Collet off Mini Master. Loosen Expanding Screw entirely, rear of Rod Assembly will then come out. To separate Sleeve from Mini Master insert snug fitting metal rod into rear of Sleeve and give a good smack with a hard hammer. Or, we suggest using the ROVI Collet Separator. Mini Master and Sleeve should separate readily.

New Line of ROVI HEAVY DUTY Expanding Collets

ROVI Products now has a line of Expanding Collets that give you greater strength and rigidity. This collet system is designed to work with machines that have either a 16C or 3J spindle. This system works off the same principle as that of the ROVI 5C system. It still includes the rod assembly, sleeve, and machineable collet. The difference is the larger size. Instead of a 1/4-28 screw, this system uses a 3/8 screw.

With this size screw, you will not have the breakage problem due to excessive hydraulic pressure on the draw tube. Also, the taper on the collet is much bigger than the 5C, thus making a stronger and more rigid expanding collet.