Just an update in case anyone is interested. I annealed the tool
holders at 1550 F. Before annealing, they tested at 45 HRC. After
annealing, they tested at 8 HRC. I have read I should use a B scale
tester, but I do not have one. A scrap piece of 1018 tested at 15
HRC, so these holders should be easy milling.
On 4/25/2024 11:37 AM, Mike Poore via
groups.io wrote:
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I did a search for that number. The indicates that is the Swedish
equivalent to 4340.
Sorry for wasting everyone's time. I hate when people ask easily
answered questions and I am guilty. I found this that lists the HT specs for
most alloys. 1550F is within the annealing range of almost every
alloy on the list. 1500F is within the hardening range for almost
all alloys. I will have to do more research on tempering, but for
an insert holder there should be a wide tolerance.
On 4/25/2024 1:17 AM, Andrei via
groups.io wrote:
Found a reference online to SS2541 being used
for tool bit holders. Maybe check that.?
The problem is I do not know the alloy. I guess I will use
the 4140 specs.
On 4/25/2024 12:59 AM, Andrei
via groups.io wrote:
That is definitely a great option. I don't
have one so my go-to was carbide and coolant.youbare in
great shape with the oven
I have a heat treating oven right next to my mill, so I
would rather use the oven.
On 4/24/2024 11:02 PM,
Andrei via groups.io wrote:
Are short of squirter bottles or
endmills?
Not an option for me.
On 4/24/2024 9:43
PM, Andrei via groups.io wrote:
Use a carbide endmill and coolant.
No need to anneal
Anyone happen to know the alloy most likely to
be used for carbide insert tool holders? My guess
is 4140. I have four that I need to mill down to
work in an AXA holder. They test at 45 HRC.
Thinking about annealing them before milling and
then heat treating again, so I would like specs to
use.
