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Posted by Damian Huckle on March 13, 2006, 8:22 pm
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Hi guys,
I've just set up a Victor 16 x 40 lathe and did some practice turning on a
2" hot-rolled mild steel round. No matter what variables I played with I
never got a satisfactory surface finish. The tooling seemed to pick-up or
drag metal, and this would lead to small gouges in the finish. I tried
various things, but never could eliminate it consistently.
Any thoughts?
Thanks,
Damian
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Posted by Rob on March 14, 2006, 8:18 am
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> Hi guys,
>
> I've just set up a Victor 16 x 40 lathe and did some practice turning on a
> 2" hot-rolled mild steel round. No matter what variables I played with I
> never got a satisfactory surface finish. The tooling seemed to pick-up or
> drag metal, and this would lead to small gouges in the finish. I tried
> various things, but never could eliminate it consistently.
>
> Any thoughts?
>
> Thanks,
>
> Damian
>
>
As Roy said it can be hard to get a good finish on hot rolled steel. I've
found the same as you - try finding some "free-machining" steel it turns
well with a nice finish. I don't know exactly what "free-machining" means,
perhaps some one else will enlighten us. I guess the alloy composition gives
it nice machining properties.
rob
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Posted by john on March 14, 2006, 9:20 pm
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Rob wrote:
>
>>Hi guys,
>>
>>I've just set up a Victor 16 x 40 lathe and did some practice turning on a
>>2" hot-rolled mild steel round. No matter what variables I played with I
>>never got a satisfactory surface finish. The tooling seemed to pick-up or
>>drag metal, and this would lead to small gouges in the finish. I tried
>>various things, but never could eliminate it consistently.
>>
>>Any thoughts?
>>
>>Thanks,
>>
>>Damian
>>
>>
>
>
> As Roy said it can be hard to get a good finish on hot rolled steel. I've
> found the same as you - try finding some "free-machining" steel it turns
> well with a nice finish. I don't know exactly what "free-machining" means,
> perhaps some one else will enlighten us. I guess the alloy composition gives
> it nice machining properties.
>
> rob
Free machining steel has, pardon the word, "Lead" in it. 12L14, leaded
steel, cuts real easy with that addition of lead. Sulfur in the matal
will make the metal cut easier too. The smaller the tool nose radius
the easier it is to get a good finish. HSS bits will give you a decent
finish at lower speeds. Carbide needs to run at a surface speed of about
600 feet per minute to get a good finish. On a finish cut you should be
taking at least .010 or it will tear the metal. Also you may have
crappy metal with a lot of "junk" in it. Some day you may be lucky
enough to cut through an unmelted tap or piece of stainless wire rope.
John
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Posted by Damian Huckle on March 14, 2006, 10:25 pm
Please log in for more thread options Funny! I wondered where that tap went!
Thanks for the insight.
>
>
> Rob wrote:
>
>>
>>>Hi guys,
>>>
>>>I've just set up a Victor 16 x 40 lathe and did some practice turning on
>>>a
>>>2" hot-rolled mild steel round. No matter what variables I played with I
>>>never got a satisfactory surface finish. The tooling seemed to pick-up
>>>or
>>>drag metal, and this would lead to small gouges in the finish. I tried
>>>various things, but never could eliminate it consistently.
>>>
>>>Any thoughts?
>>>
>>>Thanks,
>>>
>>>Damian
>>>
>>>
>>
>>
>> As Roy said it can be hard to get a good finish on hot rolled steel. I've
>> found the same as you - try finding some "free-machining" steel it turns
>> well with a nice finish. I don't know exactly what "free-machining"
>> means,
>> perhaps some one else will enlighten us. I guess the alloy composition
>> gives
>> it nice machining properties.
>>
>> rob
>
>
> Free machining steel has, pardon the word, "Lead" in it. 12L14, leaded
> steel, cuts real easy with that addition of lead. Sulfur in the matal
> will make the metal cut easier too. The smaller the tool nose radius the
> easier it is to get a good finish. HSS bits will give you a decent finish
> at lower speeds. Carbide needs to run at a surface speed of about 600 feet
> per minute to get a good finish. On a finish cut you should be taking at
> least .010 or it will tear the metal. Also you may have crappy metal
> with a lot of "junk" in it. Some day you may be lucky enough to cut
> through an unmelted tap or piece of stainless wire rope.
>
> John
>
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Posted by Jack Hayes on March 14, 2006, 4:09 pm
Please log in for more thread options
> Hi guys,
>
> I've just set up a Victor 16 x 40 lathe and did some practice turning on a
> 2" hot-rolled mild steel round. No matter what variables I played with I
> never got a satisfactory surface finish. The tooling seemed to pick-up or
> drag metal, and this would lead to small gouges in the finish. I tried
> various things, but never could eliminate it consistently.
>
> Any thoughts?
>
> Thanks,
>
> Damian
>
>
Cold rolled (1018) causes the same problem I have had much better results
turning 4140. It seems to be a good general purpose steel that can also be
tempered a bit.
Jack
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>
> I've just set up a Victor 16 x 40 lathe and did some practice turning on a
> 2" hot-rolled mild steel round. No matter what variables I played with I
> never got a satisfactory surface finish. The tooling seemed to pick-up or
> drag metal, and this would lead to small gouges in the finish. I tried
> various things, but never could eliminate it consistently.
>
> Any thoughts?
>
> Thanks,
>
> Damian
>
>