Kurt MaxLock PF420C Instruction Manual

PF420C
PF420D
PF420S
Operating Instruction Manual
ENGLISH

2
TABLE OF CONTENTS
Introduction ............................................................................................................ 3
Operating Instructions........................................................................................... 3
Installation & Mounting Guide ..........................................................................4-5
PF420 Parts List .................................................................................................... 6
PF420 Mechanical Drawing ................................................................................ 7
Standard Jaw Options .......................................................................................... 8
Centerline Adjustment & Lash Removal ............................................................ 9
Jaw Removal ........................................................................................................ 10
Machining the Carvable Jaws ........................................................................... 11
Maintenance Schedule ....................................................................................... 12
Maintenance Log/Notes ..................................................................................... 13
Iron Clad Warranty................................................................................................ 14
Thank You! ............................................................................................................. 15
VISE DATA
Use this to ll out information about your vise for quick reference.
Purchase Date: _________ -________ -_________
Purchase Order: ______________________________
Purchased From: ______________________________
Delivery Date: ______________________________
Serial No.: ______________________________
NOTE: MAKE SURE TO REGISTER YOUR WARRANTY
ONLINE AT KURTWORKHOLDING.COM
TABLE OF CONTENTS

3
INTRODUCTION
Thank you for purchasing a Kurt Precision Force vise. The PF Series of
vises are top of the line workholding options for today’s rapidly growing
5-Axis market. Backed by a lifetime warranty against workmanship and
material defects, these vises will perform at the highest levels of precision
and reliability for years to come, when used and maintained properly.
Kurt Anglock maintains it’s time tested design, which gives you the part
pull down that you need when machining high end parts. Other features
Include:
INTRODUCTION
PF Vise Clamp Force
10 ft. lbs. 720 force lbs.
20 ft. lbs. 1,520 force lbs
30 ft. lbs. 2,250 force lbs
40 ft. lbs. 3,050 force lbs
45 ft. lbs. 3,375 force lbs
• Gibbed jaws for maximum clamping
repeatability
• Multiple interchangeable jaw options
‐ Carvable (PF420C)
‐ Dovetail (PF420D)
‐ Serrated (PF420S)
• Easily adjustable center line
• Fast and effortless lash removal system
• Double ended screw for exible vise
operation
OPERATING INSTRUCTIONS
For proper vise operation insert the handle onto the hex of the vise. This
handle, combined with the correct amount of torque will provide you with
all the clamping force you will need to machine your parts. DO NOT use
any other type of pressure to open or close your vise.
The uses of handle extensions, air impact wrenches, breaker bars, or
hammer strikes are not recommended and will void the warranty if used.
This will also cause damage to the central holding block and screw
threads. If you need more clamping force you may require a larger vise.
To properly clamp a part in your Kurt vise you should place the part in
the center of the jaws. Clamping only on one side can result in loss of
accuracy. If one-sided clamping is necessary you MUST use a dummy part
on the other side.

4
INSTALLATION & MOUNTING
All of the vises in the PF Series can be mounted with 1/2 inch SHCS using
the counter-bored through holes in the center of the rails of the vise.
Additional hole locations are shown below.
INSTALLATION & MOUNTING GUIDE
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5
JAW ASSEMBLY
When you receive your new PF Series vise, you will notice that the jaws do
not come attached. To install the vise jaws, follow the steps given below.
1. Place both movable jaws on the rails of the vise, and slide the movable
jaws over the beaks of the nuts.
2. Set the rear covers into their slots in the back of the movable jaws,
then use the button head screws to anchor the rear covers to the
movable jaws.
3. Finish Securing the movable jaws by installing the spring plungers into
the rear covers. Tighten the spring plungers until they are snug, then
loosen them by 1/8 to 1/4 turn.
JAW ASSEMBLY GUIDE
JAW TIGHTENING
SPRING PLUNGER
JAW TIGHTENING
SPRING PLUNGER
MOVABLE JAW
REAR COVER
MOVABLE
JAWS

6PF420 PARTS LIST
PF420 PARTS LIST
ITEM# PART # DESCRIPTION QT Y.
1 PF420-1 Body 1
2 PF420-2* Movable Jaw 2
3 PF420-3R Nut 9/16-18 Right Hand Thread 1
4 PF420-3L Nut 9/16-18 Left Hand Thread 1
5 PF250-5 Screw 1
6 PF420-53 Rear Cover 2
7 PF420-102 Model/Serial Number Tag 1
8 PF420-169 Compression Spring 4
9 DLU4-96 O-Ring #16 2
10 PF250-195 Heavy Duty Square Nut 4
11 PF250-196 Set Screw w/Nyloc Modied 2
12 PF250-212 Central Holding Block 1
15 PF250-272 Thrust Washer Collar 1
17 PF250-311 Straight Wire Spring 2
18 PF250-364L Locking Pin Left Hand 1
19 PF250-364R Locking Pin Right Hand 1
20 PF420-366 Spring Plunger 4
21 3600V-191 Protective Cap 2
22 00-119 SHCS 8-32 X 0.562 LG 4
23 01-1853 Half Dog Set Screw 2
24 03-0021 SBHCS 10-32 X 0.375 LG 4
25 04-0028 Dowel Pin 2
26 07-0230 U-Type Drive Screw 2
27 PF420-16 Pad Guide 4
28 PF420-367 Pull Stud for Lifting Vise 2
29 PF420-10-SA P420-10-SA Handle Assembly 1
*Note: PF420C Carvable Jaw - PF420-2C
PF420D Dovetail Jaw - PF420-2D
PF420S Serrated Jaw - PF420-2S

7
20
24 6
2
27
8
25
5
25 8
4
15
19
18
12
22
23
17
11
21
9
1
10
27
24
20
3
28
7
2
26
HANDLE ASSY
NOT SHOWN
29
6
PF420 MECHANICAL DRAWING
PF420 MECHANICAL DRAWING

8
A
B
DETAIL A
DETAIL B
PF Series Carvable Jaws
Part Number: PF420-2C
PF Series Dovetail Jaws
Part Number: PF420-2D
PF Series Serrated Jaws
Part Number: PF420-2S
STANDARD JAW OPTIONS
STANDARD JAW OPTIONS

9
CENTERLINE ADJUSTMENT & LASH REMOVAL
CENTERLINE ADJUSTMENT
The PF Series of vises are designed for quick and easy adjustment of the
vise centerline.
1. Loosen the four centerline adjustment bolts using a 9/64 hex wrench
2. Adjust the centerline by sliding the nut and screw assembly within the
body of the vise. A mallet may be required to gently tap the ends of
the screw in the direction of the desired adjustment.
3. When the centerline is in the desired position, re-tighten the four
centerline adjustment bolts.
LASH REMOVAL
Along with an easily adjustable centerline, the PF vises also have an
extremely simple to use lash removal system.
1. Loosen the two lash release bolts on the top surface of the central
holding block, using a 5/64 hex wrench.
2. Tap the top of the central holding block with your nger.
3. Re-tighten the lash release bolts.
CENTERLINE ADJUSTMENT
BOLTS (4X)
LASH RELEASE
BOLTS (2X)

10
JAW REMOVAL
The Jaws on the PF 420 are easily removed. The following steps will help
you remove them for replacement or maintenance purposes.
1. Loosen the spring plungers with a at head screwdriver, to remove any
spring forces that may be pushing against the rear cover plate.
2. Loosen and remove the two button head screws that attach the rear
cover plate to the movable jaw, using a 1/8 hex wrench.
3. Slide the free jaw forward on the bed of the vise until it clears the beak
of the nut. Then lift the freed jaw off of the vise.
4. Repeat the above process for the second jaw.
JAW REMOVAL
BUTTON HEAD SCREWS
ATTACH REAR COVER
TO JAW
SPRING PLUNGERS
TIGHTEN JAW TO NUT

11
.490
.180
.293
.365
SHORTEST DISTANCE
POSSIBLE
BED OF VISE PARALLELS
CUT
GEOMETRY
CUTTING
BOUNDARY LINE
MACHINING THE CARVABLE JAWS
MACHINING THE CARVABLE JAWS
For the best results when machining the carvable jaws for the PF Series of
vises, follow the procedure below.
1. Use parallels, vise hard jaws, or other precision cut blocks that are set
just below the cut surface as shown in the diagram below.
2. Clamp your precision blocks in the vise. For the best accuracy, clamp
the vise to the same amount of torque you will be using during
production when cutting your jaws.
3. Do not cut inside the boundaries of the scribed lines on the jaw
blanks. Cutting inside of these lines will damage the internal features
of the jaw. Dimensions are shown below.

12 MAINTENANCE SCHEDULE
MAINTENANCE SCHEDULE
It is very important to perform regular maintenance on your Kurt vise to
assure proper operation. Improper maintenance will result in poor vise
performance and may void your warranty.
Daily/Weekly
1. Remove chips from surface of vise.
2. Visually inspect for chips, seals for damage and cleanliness.
3. Visually inspect for chip entrapments and remove when necessary.
4. Air-dry and apply rust inhibiting oil to the machined surface of the vise.
Monthly
1. Open the vise to the maximum opening.
2. Remove the movable jaws using the procedure on page 10.
3. Turn the movable jaw over and clean the inside cavity.
4. Remove any chips, clean and apply a light coat of machine oil to the
machined surface of the following item
a. Nut and Screw assembly (clean exposed threads on the screw)
b. Bed of vise (top of “rails”)
c. Inside of the vise between the center ways.
5. Your vise is now ready for use. Open and close your vise to check
for proper operation. Center the part to be clamped in the vise and
close. Your parts should be centered from side to side to insure proper
clamping. (See Fig.1 below)

13
MAINTENANCE LOG/NOTES
MAINTENANCE LOG/NOTES:

14
All Kurt Manufacturing Company industrial workholding products and parts
with the exceptions noted below, are warranted against defects in material and
workmanship for the life of the product or part. (The life of the product is dened
as that point in time when such item no longer functions due to normal wear
and tear.) Failure to properly maintain and/or properly operate the product or
part that has been worn out, abused, heated, ground or otherwise altered, used
for a purpose other than that for which it was intended, or used in a manner in
consistent with any instructions regarding its use. The sole obligation of Kurt
Manufacturing Company, Inc. (Kurt) and the purchaser’s SOLE AND EXCLUSIVE
REMEDY hereunder, shall be limited to the replacement or repair of any Kurt
product or part (by an authorized Kurt technician) which are returned to Kurt
Manufacturing Company’s place of business or any authorized service center,
transportation, shipping and postal charges prepaid, and there determined by
Kurt Manufacturing Company to be covered by the warranty contained herein.
THE LIMITED WARRANTY DESCRIBED HEREIN IS MADE EXPRESSLY IN LIEU OF
ANY OTHER EXPRESSED OR IMPLIED WARRANTIES, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
KURT MANUFACTURING COMPANY IS NOT RESPONSIBLE FOR THE IMPROPER
USE OF ITS PRODUCTS. KURT SHALL NOT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL SPECIAL OR CONSEQUENTIAL DAMAGES, INCLUDING
BUT NOT LIMITED TO, LOSS OF USE, REVENUE OR PROFIT.
KURT ASSUMES NO LIABILITY FOR, AND MAKES NO WARRANTY REGARDING
ANY PURCHASE ITEMS WHERE THE MANUFACTURER OF SUCH ITEM EXTENDS
A SEPARATE WARRANTY.
WARRANTY

Manual Revision:
2020-05-12
Thank you for your
purchase! If you
have any feedback
or questions please
contact us at.
kurtworkholding.com
Kurt Industrial Products//A Division Of Kurt Manufacturing
9445 East River Road NW | Mpls, MN 55433 | [e-mail]
Phone [phone] | Toll Free 877-226-7823
Fax [phone] | Toll Free Fax [phone]