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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

I’ve found that the generic carbide endmills in smaller sizes available on Amazon are not only cheap but completely satisfactory for most hobbyist uses. In fact, they’re way better than

Cheaper to get a carbide endmill than to risk losing 4 holders to heat treat problems. ________________________________ Sent: Thursday, April 25, 2024 12:09 AM To: SouthBendLathe@groups.io

??? Aloris are? case hardened . https://www.practicalmachinist.com/forum/threads/aloris-tool-holders-are-they-case-hardened-or-through-hardened.393046/ animal

SACRILEDGE ! .. ok, an answer to a question not asked ... but I have made insert holders from bar 2024 aluminum ... special limited use yes but up to the chip forces I was creating. be more than ok

I did a search for that number. The link <http://www.steelnumber.com/en/equivalent_steel_iron_eu.php?zname_id=3045> indicates that is the Swedish equivalent to 4340. Sorry for wasting everyone's

It could be something such as 1045. Tool holders don’t need to be 4140. That doesn’t mean for certain that they aren’t, but medium carbon steel is fine. 1045 hardens to RC 45 after tempering at

Found a reference online to SS2541 being used for tool bit holders. Maybe check that. Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Thursday, April 25, 2024

It is a reasonable assumption Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Thursday, April 25, 2024 1:09:21 AM To: SouthBendLathe@groups.io

The problem is I do not know the alloy. I guess I will use the 4140 specs.

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 Get Outlook for

I have a heat treating oven right next to my mill, so I would rather use the oven.

Are short of squirter bottles or endmills? Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Wednesday, April 24, 2024 10:38:03 PM To: SouthBendLathe@groups.io

You can use a squit bottle to send coolant to the cut Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Wednesday, April 24, 2024 10:38:03 PM To:

Not an option for me.

Use a carbide endmill and coolant. No need to anneal Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Wednesday, April 24, 2024 9:41:39 PM To:

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

Correct. I guess we need to know if they made a QCGB for his older model. Otherwise, he will need to make one from another model fit.

You don't have a workshop lathe, you have the older, heavier, wide-bed 'Series O' 9" lathe. In the late 30's, this lathe was improved (Series R, S, T etc) and had its swing raised to make the Heavy 10

Doesn't the B also have power crossfeed ? animal