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Re: [ATM] Another machining question, please
Thanks all for the tips!
Gary Fuchs
Don Clement wrote:
>IMO, it is not a good idea to dunk a hot HSS bit in water coolant in between
>grinding. Dunking hot HSS in water in water does not change the hardness or
>temper, but can cause micro cracks in the surface. I grind slow or let the
>HSS bit remain hot (red hot is OK for HSS) or cool with a constant coolant
>stream. I use the constant flow of cold air from a vortex cold air gun while
>grinding.
>
>Don Clement
>Running Springs, California
>
>
>
>
>>Other than take it slow when grinding, don't push too hard, try to keep
>>
>>
>the
>
>
>>two edges equal in angle and cutting area/width, and cool often, I usually
>>grind for about 2-3 seconds dip in the coolant (water, or soluble oil work
>>great) for about 5-10 seconds (really depends on the size the object is
>>
>>
>and
>
>
>>how critical maintaining the hardness/temper is) biggerFrom - Sat Feb 17 09:44:37 2007
>>
>>
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>Subject: Re: [ATM] Another machining question, please
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>
>IMO, it is not a good idea to dunk a hot HSS bit in water coolant in between
>grinding. Dunking hot HSS in water in water does not change the hardness or
>temper, but can cause micro cracks in the surface. I grind slow or let the
>HSS bit remain hot (red hot is OK for HSS) or cool with a constant coolant
>stream. I use the constant flow of cold air from a vortex cold air gun while
>grinding.
>
>Don Clement
>Running Springs, California
>
>
>
>
>>Other than take it slow when grinding, don't push too hard, try to keep
>>
>>
>the
>
>
>>two edges equal in angle and cutting area/width, and cool often, I usually
>>grind for about 2-3 seconds dip in the coolant (water, or soluble oil work
>>great) for about 5-10 seconds (really depends on the size the object is
>>
>>
>and
>
>
>>how critical maintaining the hardness/temper is) bigger items get a longer
>>dunking....
>>
>>
>
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