c

05/06/2006 3:01 PM

How hard are jointer/planer knives?

I have an Inca 410 jointer/planer and I would like an extra set of
knives. They are no longer made, and are a strange size (8-5/8" by 1"
by 3/32" thick). I haven't been able to find anything compatible,
either.

McMaster sells D2 tool steel that is 3/32" thick by 1" wide by 18" long
for about $28. They say it is "Wear-Resistant Air-Hardened D2 Tool
Steel." Hardness is specified as "B89-B102" with a maximum attainable
hardness of C62-C65. I have found a local sharpening shop that will
cut it into two knives and sharpen them for less than $20.

My question is whether the initial B89-B102 hardness is enough, or if
they would require additional hardening. If B89-B102 is enough, then
$50 doesn't seem too bad for a custom set of knives. But if additional
hardening is required, I imagine that would be expensive and extra
complicated.

McMaster also have a 4140/4142 steel that they say is hardened to
C28-C32. However, I have seen D2 mentioned for planer knives but never
4140/4142, so I don't know if this 4140 steel is appropriate?

Any opinons?

Thanks,
Phil


This topic has 6 replies

c

in reply to [email protected] on 05/06/2006 3:01 PM

05/06/2006 7:23 PM

Hi, thanks for the reply.

Have any idea where I can get this stock hardened? Is this something I
can find a local outfit to do, and would it be very expensive?

Thanks,
Phil

Jim wrote:
> <[email protected]> wrote in message
> news:[email protected]...
> >I have an Inca 410 jointer/planer and I would like an extra set of
> > knives. They are no longer made, and are a strange size (8-5/8" by 1"
> > by 3/32" thick). I haven't been able to find anything compatible,
> > either.
> >
> > McMaster sells D2 tool steel that is 3/32" thick by 1" wide by 18" long
> > for about $28. They say it is "Wear-Resistant Air-Hardened D2 Tool
> > Steel." Hardness is specified as "B89-B102" with a maximum attainable
> > hardness of C62-C65. I have found a local sharpening shop that will
> > cut it into two knives and sharpen them for less than $20.
> >
> > My question is whether the initial B89-B102 hardness is enough, or if
> > they would require additional hardening. If B89-B102 is enough, then
> > $50 doesn't seem too bad for a custom set of knives. But if additional
> > hardening is required, I imagine that would be expensive and extra
> > complicated.
> >
> > McMaster also have a 4140/4142 steel that they say is hardened to
> > C28-C32. However, I have seen D2 mentioned for planer knives but never
> > 4140/4142, so I don't know if this 4140 steel is appropriate?
> >
> > Any opinons?
> >
> > Thanks,
> > Phil
> >
> D2 is a tool steel. 4140/4142 is a different beast entirely.
> I would use D2 and I would get it hardened to C61-C65.
> That would ensure maximum life for the knives.
> Jim

bb

"bc"

in reply to [email protected] on 05/06/2006 3:01 PM

05/06/2006 9:44 PM


[email protected] wrote:
> I have an Inca 410 jointer/planer and I would like an extra set of
> knives. They are no longer made, and are a strange size (8-5/8" by 1"
> by 3/32" thick). I haven't been able to find anything compatible,
> either.
>

>
> Any opinons?
>
> Thanks,
> Phil
Try Global Tooling @ http://globaltooling.bizhosting.com/index.html.
Their web site says that they will cut to size. The prices are pretty
good at least for standard sizes ( I got a set of 15" carbide tipped
knives for $174.00) and I had no troubles with my order.
BC
PS The usual disclaimers, don't work for them, don't get any kickback
from them etc., etc.

Pn

Prometheus

in reply to [email protected] on 05/06/2006 3:01 PM

05/06/2006 9:57 PM

On 5 Jun 2006 15:01:31 -0700, [email protected] wrote:

>I have an Inca 410 jointer/planer and I would like an extra set of
>knives. They are no longer made, and are a strange size (8-5/8" by 1"
>by 3/32" thick). I haven't been able to find anything compatible,
>either.
>
>McMaster sells D2 tool steel that is 3/32" thick by 1" wide by 18" long
>for about $28. They say it is "Wear-Resistant Air-Hardened D2 Tool
>Steel." Hardness is specified as "B89-B102" with a maximum attainable
>hardness of C62-C65. I have found a local sharpening shop that will
>cut it into two knives and sharpen them for less than $20.

Have you asked the sharpening shop? They're usually pretty savvy
about this sort of thing- you're just getting opinions that are
sometimes great and sometimes crazy here. If you don't know, you
can't pick the right ones!

Jj

Jody

in reply to [email protected] on 05/06/2006 3:01 PM

06/06/2006 1:47 PM

bc wrote:
>
> Try Global Tooling @ http://globaltooling.bizhosting.com/index.html.
> Their web site says that they will cut to size. The prices are pretty
> good at least for standard sizes ( I got a set of 15" carbide tipped
> knives for $174.00) and I had no troubles with my order.
> BC
> PS The usual disclaimers, don't work for them, don't get any kickback
> from them etc., etc.
>

I get all my knives from global. Very easy people to work with. They
stock 3/23 knives but not in the size you need. They can cut a balanced
set any length you need.

Jj

"Jim"

in reply to [email protected] on 05/06/2006 3:01 PM

06/06/2006 12:41 AM


<[email protected]> wrote in message
news:[email protected]...
>I have an Inca 410 jointer/planer and I would like an extra set of
> knives. They are no longer made, and are a strange size (8-5/8" by 1"
> by 3/32" thick). I haven't been able to find anything compatible,
> either.
>
> McMaster sells D2 tool steel that is 3/32" thick by 1" wide by 18" long
> for about $28. They say it is "Wear-Resistant Air-Hardened D2 Tool
> Steel." Hardness is specified as "B89-B102" with a maximum attainable
> hardness of C62-C65. I have found a local sharpening shop that will
> cut it into two knives and sharpen them for less than $20.
>
> My question is whether the initial B89-B102 hardness is enough, or if
> they would require additional hardening. If B89-B102 is enough, then
> $50 doesn't seem too bad for a custom set of knives. But if additional
> hardening is required, I imagine that would be expensive and extra
> complicated.
>
> McMaster also have a 4140/4142 steel that they say is hardened to
> C28-C32. However, I have seen D2 mentioned for planer knives but never
> 4140/4142, so I don't know if this 4140 steel is appropriate?
>
> Any opinons?
>
> Thanks,
> Phil
>
D2 is a tool steel. 4140/4142 is a different beast entirely.
I would use D2 and I would get it hardened to C61-C65.
That would ensure maximum life for the knives.
Jim

Cc

"CW"

in reply to [email protected] on 05/06/2006 3:01 PM

06/06/2006 3:43 AM

If you look hard enough, you might find a small machine shop that will
harden for you. Good luck. The place that does ours has a minimum charge of
$300.00. We do small stuff in house but send out larger quantities.

<[email protected]> wrote in message
news:[email protected]...
> Hi, thanks for the reply.
>
> Have any idea where I can get this stock hardened? Is this something I
> can find a local outfit to do, and would it be very expensive?


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