Jointer Blades - Woodworking Talk - Woodworkers Forum
 
Thread Tools Display Modes
post #1 of 13 Old 10-11-2013, 01:45 PM Thread Starter
Member
 
Join Date: Sep 2013
Location: Maumee, Ohio
Posts: 44
View WoodMachiner's Photo Album My Photos
Jointer Blades

Recently I bought a used Delta Jointer model 37-190. I knew when I bought it that the knives where dinged up. I did some research and saw some recommendations to only by the Delta knives so I did. Upon receiving them I was inspecting them to see how straight the cutting edge is. To make a long story short here, I found that the center of all the knives has about a .02” curve to them so that the edges are raised up in a concave way. Is there a reason for this? I was going to build a sharpening jig for the existing set of blades so I have back ups, but was shocked to discover that the “new” blades where not straight to begin with. Now before you tell me that I am being ridiculous here, I work in the tool and die trade and .005” is considered a loose tolerance, am I being too precise here? Should I not worry about it?
WoodMachiner is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 10-11-2013, 01:52 PM
Senior Member
 
Dave Paine's Avatar
 
Join Date: May 2012
Location: Eastern PA
Posts: 7,221
View Dave Paine's Photo Album My Photos
I cannot explain how the knives got the curve. Perhaps stress during manufacture or initial grinding.

When you install these, the gibs screws will flatten out in the jointer, so the only issue is sharpening.

I think a professional sharpening service likely clamps the knives in place so they should be flat whilst being sharpened.

I also have a Delta 37-190. I purchased a replacement set of knives decades ago. I do not recall who made them, but they have worked well.

I also made a quick-and-easy jig to hold the knives so I could sharpen with abrasive paper on a granite slab.

I made a single cut in a scrap of wood with the table saw blade at appropriate angle. Just needed to tweak for the depth of the cut.

Just needs to be tight enough to hold while using the abrasive paper. Works for my needs.

Name:  Jig_jointer_knife_sharpening_1317.jpg
Views: 198
Size:  41.6 KB
Dave Paine is offline  
post #3 of 13 Old 10-11-2013, 03:53 PM
Senior Member
 
Maylar's Avatar
 
Join Date: Sep 2013
Location: South Central Connecticut
Posts: 1,147
View Maylar's Photo Album My Photos
If the bow is in the vertical axis, i.e. the ends will be higher than the middle when the knives are installed, then what you have is unacceptable. The cutting edge should be dead flat across the width of the knife.

Dave in CT, USA
Maylar is offline  
Sponsored Links
Advertisement
 
post #4 of 13 Old 10-11-2013, 05:44 PM Thread Starter
Member
 
Join Date: Sep 2013
Location: Maumee, Ohio
Posts: 44
View WoodMachiner's Photo Album My Photos
Quote:
Originally Posted by Maylar
If the bow is in the vertical axis, i.e. the ends will be higher than the middle when the knives are installed, then what you have is unacceptable. The cutting edge should be dead flat across the width of the knife.
That is kind of what I was thinking. I figured that it would make the wood bow outward in the middle. Being I have access to a machine shop I think I will return these and might just make my own.
WoodMachiner is offline  
post #5 of 13 Old 10-11-2013, 05:59 PM
Senior Member
 
Join Date: Oct 2009
Location: Riverside CA
Posts: 473
View Old Skhool's Photo Album My Photos
Please do return them. Maybe if every bad set is returned they will get the message.
Old Skhool is offline  
post #6 of 13 Old 10-11-2013, 10:24 PM
Senior Member
 
Join Date: Sep 2011
Posts: 25,992
View Steve Neul's Photo Album My Photos
I think we had this topic come up last year. Somebody had curved blades and checking the straight edge off the machine they were off but once installed the edge was forced straight. When they are ground sharp at the sharpening shop the machine flattens them while they are sharpened. It doesn't matter what they are like off the jointer.
Steve Neul is offline  
post #7 of 13 Old 10-12-2013, 09:02 AM Thread Starter
Member
 
Join Date: Sep 2013
Location: Maumee, Ohio
Posts: 44
View WoodMachiner's Photo Album My Photos
Quote:
Originally Posted by Steve Neul
I think we had this topic come up last year. Somebody had curved blades and checking the straight edge off the machine they were off but once installed the edge was forced straight. When they are ground sharp at the sharpening shop the machine flattens them while they are sharpened. It doesn't matter what they are like off the jointer.
I did push them flat and they where still curved. I checked all of the surfaces and they were not parallel at all. Not the type of quality I would expect for a $60 set of knives. The are getting returned on Monday.
WoodMachiner is offline  
post #8 of 13 Old 10-12-2013, 01:51 PM
Old Methane Gas Cloud
 
Join Date: Jun 2009
Location: Huntington Beach, California
Posts: 3,500
View rrich's Photo Album My Photos
This is the old Jesada company. They made knives for just about everything.

http://jesada.com/index.php?page=sho...chk=1&Itemid=1

I think that these will fit your jointer.

http://jesada.com/index.php?page=sho...emart&Itemid=1

Use the right tool for the job.

Rich (Tilting right)
Huntington Beach, California
Remember that when we have the "BIG ONE" everything east of the Rockies falls into the ocean.
rrich is offline  
The Following User Says Thank You to rrich For This Useful Post:
WoodMachiner (10-12-2013)
post #9 of 13 Old 10-12-2013, 03:00 PM Thread Starter
Member
 
Join Date: Sep 2013
Location: Maumee, Ohio
Posts: 44
View WoodMachiner's Photo Album My Photos
Quote:
Originally Posted by rrich
This is the old Jesada company. They made knives for just about everything. http://jesada.com/index.php?page=sho...chk=1&Itemid=1 I think that these will fit your jointer. http://jesada.com/index.php?page=sho...emart&Itemid=1
Yes those will fit my jointer. I've never heard of Jessada before are they a good blade manufacturer?
WoodMachiner is offline  
post #10 of 13 Old 10-12-2013, 03:13 PM
Old Methane Gas Cloud
 
Join Date: Jun 2009
Location: Huntington Beach, California
Posts: 3,500
View rrich's Photo Album My Photos
Quote:
Originally Posted by WoodMachiner View Post
Yes those will fit my jointer. I've never heard of Jessada before are they a good blade manufacturer?
A very long story . . . .

Jesada was a manufacturer of very good quality router bits. Then FWW did a test of router bits, 1/2" shank 3/4" diameter straight cut. The test was using a CNC machine. The Jesada bits were not designed to be used in a CNC machine. However FWW painted all of their router bits with the same brush and consequently the owner was forced to sell off the business for retirement money.

The business was acquired by RT Razor Tools. Apparently the same people and machines.

BTW - One of the owner's children has reopened a router bit company, Infinity.

I have not used any of the Jesada jointer or planer knives but I am exceptionally happy with a dado blade and many router bits.

Use the right tool for the job.

Rich (Tilting right)
Huntington Beach, California
Remember that when we have the "BIG ONE" everything east of the Rockies falls into the ocean.
rrich is offline  
post #11 of 13 Old 10-12-2013, 03:49 PM
Member
 
Join Date: Oct 2013
Location: Milwaukee WI
Posts: 53
View Seubs070's Photo Album My Photos
Here is another source for Jointer and Planer Knives. I haven't used these before but the price is very good and i have heard from reliable sources that the knives are good quality.

http://globaltooling.bizhosting.com/...er-knives.html
Seubs070 is offline  
post #12 of 13 Old 10-12-2013, 05:26 PM
Senior Member
 
Danno's Avatar
 
Join Date: Apr 2009
Location: Ajax, Ontario, Canada
Posts: 526
View Danno's Photo Album My Photos
Check out FS Tool. I have never had any problems with them. Be it saw blades, knives, or bits.
Danno is offline  
post #13 of 13 Old 10-12-2013, 05:28 PM
Senior Member
 
Stevedore's Avatar
 
Join Date: Dec 2011
Location: Morris County, New Joisey
Posts: 547
View Stevedore's Photo Album My Photos
I bought a set of Freud knives for my Delta jointer from Amazon about a year ago. They work well for me. I measured my originals & found an exact match. They have many sizes available.
Stevedore is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Honing Jointer Blades How to woodnthings General Woodworking Discussion 6 11-18-2016 01:48 PM
Jointer blades jdcoving Power Tools & Machinery 2 12-20-2009 04:10 PM
jointer blades moncrief Power Tools & Machinery 2 02-14-2009 10:19 AM
Jointer blades billyre Project Showcase 5 10-09-2008 07:26 PM
Jointer blades billyre Power Tools & Machinery 0 08-04-2008 08:37 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome