Buy Starrett 657AA Magnetic Base Complete Set with Base, Upright Post, Rod, Attachment, and Two SnugsStarrett 657AA Magnetic Base Complete Set with Base, Upright Post, Rod, Attachment, and Two Snugs Product Description:
- Compatible with Starrett test, back-plunger, dial, AGD, and miniature-dial indicators, as well as similar indicators from other manufacturers
- Includes magnetic base, upright base post, two snugs, rod, and indicator attachment
- Push-button on/off switch for one-handed operation
- Grips horizontally, vertically, and upside down for versatility
- Upright base post has overall length of 7-7/16" length, with an adjustable 6" long rod
Product Description
Starrett 657AA Magnetic Base indicator holder is an all-inclusive kit for use with all Starrett test, back-plunger, dial, AGD, and miniature-dial indicators, as well as similar indicators from other manufacturers. The set includes a Starrett 657P magnetic base, a 657G upright base post, a 657S snug, a 657X rod, a 657Y indicator attachment, and a PT18724 snug.
The 657P magnetic base is 1-15/16” x 1-5/8” x 1-7/8” (50 x 40 x 48 mm) and has a push-button on/off switch for one-handed operation. The base has three precision-ground, magnetic contact points to grip horizontally, vertically, and upside-down. The V-step holds the base to arbors, shafts, and other cylindrical items. The base has an additional 1/4-20 tapped hole on one side for mounting the post. The magnetic base has a non-skid, black wrinkle finish on all non-working surfaces. The base post is 3/8” (9.5 mm) in diameter and 7-7/16” (190 mm) long. The Starrett 57S and 58S snugs may also be used with this post (sold separately). The 657S snug has two 1/4” (6.3-mm) diameter holes and adapts the 196, 650, and 651 series dial indicators and the 657Y indicator attachment to the 657X rod. The 657X rod is 1/4” (6.3 mm) in diameter and 6” (150 mm) long. It accommodates the Starrett 708, 709, 811, and 711F series dial test indicators. The 657Y indicator attachment has a 1/4” (6.3-mm) outer diameter hole on one end, while the other end is threaded to fit the backs of all AGD indicators (Starrett series 81, 25, 655, and 656) and series 80 miniature indicators. The PT18724 snug has a 3/8” (9.5 mm) diameter post hole and a 1/4” (6.3-mm) diameter gripping hole to accommodate the 657X rod.
Magnetic bases are magnetic fixtures commonly used in metalworking to hold dial indicators, and are also used in other fields, such as optics. Magnetic bases can assist the user with setting up a workpiece in a milling machine, surface grinder, or other machine tool. The vertical post and rod in a magnetic base connect using swiveling connectors, or snugs. This allows free motion of the arm so that the dial indicator can be moved into position on the workpiece. Many magnetic bases have a V-step, which is a V-shaped notch in the base for holding the base to arbors, shafts, and other cylindrical items. The magnetic base has a circular hole through the center. A round permanent magnet is inserted into this hole, and a handle or button is attached to allow the user to rotate the magnet. Rotating the magnet turns the base on and off as this causes the position of the magnetic field to rotate as well. In the on position, the iron is acting as an extension of the magnet, while in the off position, the magnet is acting as a keeper, preventing the magnetic field from extending through the base.
The L. S. Starrett Company was founded in 1880, originally manufacturing bench vises, squares, and other tools. They acquired other companies throughout the years, expanding their services into making precision measurement instruments and tools, such as calipers, micrometers, saw blades, and gauges. Starrett is headquartered in Athol, Massachusetts and has manufacturing facilities in Brazil, the United Kingdom, China, and other locations.
What’s in the Box
- No. 657P Magnetic Base
- No. 657G Upright Base Post
- No. 657S Snug
- No. 657X Rod
- No. 657Y Indicator Attachment
- No. PT18724 Snug
Customer Reviews
Most helpful customer reviews
0 of 0 people found the following review helpful.
IT'S A STARRETT
By CRICKER JR
You can't go wrong with Starrett Instruments. I have been using Starrett measuring tools for many years and have yet to find a problem or calibration problem. You get what you pay for except Starrett tools are a better value because they last.
0 of 0 people found the following review helpful.This is what quality looks like.
By David Burrell
I've used several of these types of bases before and none of them have the quality that this Starrett base has. There is more quality in the knurling on the screw than in the entire unit of the others I have used. This unit is solid. There is not one piece of plastic on it. The rods are smooth and the connectors hold tight. The base can be mounted it many positions, even perpendicular to the spindle by using the angled ledge on the top front. Highly recommended.
0 of 0 people found the following review helpful.excellent mag base
By T. C. Mathis
the base holds very strongly when magnet is turned on.the connectors for the rods are metal not plastic as the others i looked at.if you are in need of an indicator holder you can't go wrong with this one.
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