Using the DOT® 89-M370 Bench Mount Hand Press

Introduction

The DOT® model M370 (see attached diagram) is a hand-operated press designed to attach a wide variety of metal and plastic fasteners. Tools used to attach Scovill and DOT brand fasteners are available through our main office at 706-754-1000, and through various distributors. Lower tools are commonly identified by a deep set edge or spring-loaded sleeve around the outer edge of the tool to keep the fastener correctly aligned. Upper tools are identified by a design or mechanism that actively holds the fastener in position until the attachment is made. Some tools are designed to be used as either upper or lower, making it possible to choose the side of the attaching surface that is visible to the operator.

Basic Setup

The DOT® M370 hand press should be securely attached to a workbench or wide platform to provide the necessary stability during the attaching process. There are four slots, two on each side at the base of the press, that accept 3/8” diameter bolts for this purpose. Position the M370 so that it points directly toward the operator, allowing the handle (M370-2) to be pulled toward the operator. While it is possible to use the M370 without securing it in this manner, it is highly recommended that it be bolted down. This will reduce operator fatigue, prevent injury, and provide maximum accuracy in placing fasteners. The press is in the normal start position when the handle (M370-2) extends straight up. In this position the fasteners are loaded into the upper and lower tools. The handle is then moved forward or backward to move the upper tool down and bring the two fasteners together, completing one attachment.

Installing and Adjusting the Setting Tools

The main requirement for the setting tools used with the M370 is that the shank of the tool that is inserted into the upper tool holder/plunger (M370-3) or lower tool holder (M240-12S) must be 3/8” in diameter. Tools that have different lengths can normally be accommodated by adjusting the lower tool holder (M240-12S) up or down.

To correctly install the tools, use the following procedure.

1.   Loosen the setscrew (M369-4), and insert the upper tool into the upper tool holder
(M370-3). The shoulder of the tool should make contact with the end of the upper tool holder. Tighten the setscrew.

2.   Loosen the setscrew on the wide collar at the top of the lower tool holder (M240-12S), and insert the lower tool. Tighten the setscrew on the wide collar.

3.   Loosen the lock nut, underneath the front portion of the M370, that secures the lower tool holder.

4.   Slowly pull the handle (M370-2) forward until the full downward stroke of the press is achieved. The upper and lower tools should not be making contact at this point. If they are touching, turn the lower tool holder clockwise to move the lower tool downward until the tools do not touch.

5.   While keeping the M370 in its full downward position, rotate the lower tool holder counterclockwise until the upper and lower tools touch each other. Move the handle back to the start position, pointing straight up. Rotate the lower tool holder clockwise about one or two complete turns to allow for the thickness of the fasteners being attached and the thickness of the material foundation.

6.   Place the required fasteners onto the upper and lower tools. Position the material on which the fastener will be attached. Pull the handle forward so that the full downward stoke of the M370 is achieved, making one attachment.

Evaluate the attachment to determine if it is too loose or too tight. A correctly attached fastener will fit snugly to the surface of the foundation, and will not turn or spin easily. An attachment that is too loose will turn freely on the foundation, and may eventually pull out. An attachment that is too tight may cut the foundation material, or have distorted or damaged surfaces that will prevent the fastener from functioning correctly. The lower tool holder should be adjusted up or down in small increments until the correct amount of pressure is obtained. Generally, you should use just enough pressure to keep the fastener from moving easily on the foundation. Inspect the attachments periodically to be sure the fasteners remain securely attached, and that there is no damage to the fastener components.

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Last modified: 11/10/06