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> Products > Wedge Grips (pullers) Straighteners Wedge Grips Wire Straighteners Brakes and Clutches Machines Tensile

Frequently Asked Questions

How do I determine what style puller is best for my equipment?

How do I calculate die-pull?

How do I know if I need standard or special jaws?


Q.1. How do I determine what style puller is best for my equipment?

A.1. There are several variables you should consider when selecting a wedge grip:

  • Operator Preference, speak with the operator:
    – What style is the operator currently using?
    – What does the operator like/dislike?
  • Wire/Die-Pull Data
    – Pointed wire diameter/pointed wire diameter range
    – Maximum die-pull (see below)
    – Wire tensile strength
    – % reduction area (see K Factor - % Reduction Table below)
    – Wire toughness or hardness
    – Type of drawing block hookup
    – Length of puller assembly needed

Once you’ve gathered the data above, you can follow the guidelines below to select from the three styles Sjogren offers. Please do not hesitate to contact Sjogren’s Engineering team if you have any questions, 508-987-3206 or sales@sjogren.com.

Style/Description

Morgan-style

Robust, heavy-duty construction grip with capacities up to 1" diameter and 40,000 lbs. of pull.

Features

  • Simple spring loading to operate jaws simultaneously
  • Elliptically designed spring seat to mount grip to standard lifting chain
  • Heavy-duty construction to allow high die pull
  • Optional clevis to enable tangent die pull
  • Simple jaw design, easily replaced without tools
  • Additional hook-up options are available

Typical Applications

Wire-drawing machines with a link chain and connected to the drawing block with an oblong link slipped over a post at the top of the block.
     

Style/Description

Vaughn-style

Medium-duty construction grip with capacities up to
1 1/4" diameter and 50,000 lbs. of pull.

Features

  • One piece casting to make it lightweight
  • Quick-release hook to release tension quickly from puller
  • Simple jaw design, easily replaced without tools
  • Additional hook-up options are available

Typical Applications

Wire-drawing machines with a leaf-style chain and a quick-release hook assembly for releasing tension after the pull. Larger sizes use link chain and oblong link hooks.
NOTE: Vaughn style quick-release hooks must be used with Vaughn style blocks.
     

Style/Description

Sleeper & Hartley-style

Light-duty construction grip with capacities up to 1/2" diameter and 10,000 lbs.
of pull

Features

  • Simple attachment to standard roller chain makes it economical
  • Optional thumb release for single hand operation
  • Simple jaw design, easily replaced without tools
  • Additional hook-up options are available

Typical Applications

Uses a roller chain and a
pin-type hook that fits into a radial hole in the drawing block. Thumb-release pullers are used to ease loading and
unloading of the wire grip. Pulling the back latch retracts the jaws into the body and holds them open. Units are completely interchangeable with standard S&H grip heads.

Accessories

Style/Description

Spring Loaded Safety Chain

Designed to enhance an operator’s safety by tensioning the puller assembly while stringing up the drawing block. Eliminates the need for the operator to hold the assembly in place during start-up.

Features

  • Standard length chain with a master link for each end to connect to the puller and hook, and any additional accessories desired
  • Teflon wear pads fastened to the bent links of chain which contact the drawing block

Typical Applications
Used when block marking is a problem, when operator safety is a concern and/or when you have less than 5,000 lbs. of die pull.
 

Aluminum Shoes

Mount to the bottom of the puller bodies; present a soft, wearable surface to minimize marking of the drawing block.
  • Easy to attach and replace
  • Affixed with strong adhesive
  • Economical

Used when block marking is
a problem.

 

Thumb-Release
Puller Assemblies

Allow the jaws to be retracted for easier insertion of the wire. Are available in the S&H series up to 1/2" diameter capacity.
  • Simple attachment to standard roller chain makes it economical
  • Thumb release for single hand operation
  • Additional hook-up options are available

Uses a roller chain and a
pin-type hook that fits into a radial hole in the drawing block. Thumb-release pullers are used to ease loading
and unloading of the wire grip. Pulling the back latch retracts the jaws into the body and holds them open. Units are completely
interchangeable with standard S&H grip heads.

 

Clevis-style Attachments

For tangential wire pull.
  • Utilizes standard Morgan-style grip head
  • Chain attachment to suit customer application
 Reduces pressure on wire and minimizes wire breakage and jaw wear. Designed for use with up to 40,000 lbs. of die pull.

 

 

Q.2. How do I calculate die-pull?

A.2. Die-Pull Calculation:*

P=43.56d** x SK
P = die pull in pounds
d = diameter after drawing in inches (in)
S = tensile strength before draft, in pounds per square inch (PSI)
K = factor which varies with the percentage reduction as shown in K Factor—% Reduction Table below

K Factor—% Reduction Table**

% Reduction
K
% Reduction

K

% Reduction

K
10
.0054
26
.0115
41
.0184
11
.0058
27

.0118

42

.0190
12
.0066
28
.0120
43
.0195
13
.0070
29
.0121
44
.0200
14
.0072
30
.0124
45
.0206
15
.0081
31
.1029
46
.0214
16
.0082
32
.0134
47
.0222
17
.0084
33
.0139
48
.0224
18
.0090
34
.0146
49
.0227
19
.0092
35
.0150
50
.0232
20
.0097
36
.0155
51
.0234
21
.0102
37
.0161
52
.0238
22
.0104
38
.0166
53
.0243
23
.0107
39
.0172
54
.0246
24
.0110
40
.0176
55
.0250
25
.0112

 

 

 

**Die-Pull Calculation from Steel Wire Handbook, Volume 1, The Wire Association, page 235
**K Factor—% Reduction Table from Steel Wire Handbook, Volume 1, The Wire Association, page 236

 

Q.3. How do I know if I need standard or special jaws?

A.3. It depends on the material you’re working with. Standard puller assemblies are supplied with jaws of the proper size tooth pattern to match the wire-diameter range for medium and low carbon steel and non-ferrous material. Special jaws with straight or diagonal teeth, and finer than the standard tooth pattern, can be supplied for harder, tougher materials that allow limited penetration.