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Posted by George on March 14, 2008, 3:57 am
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wrote:
> On Thu, 13 Mar 2008 13:21:42 -0700 (PDT), George
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> >At a car boot sale, I found a really heavy duty triangular tool insert
> >holder. When I got home, I found that it would not fit in the tool
> >post of my huge Herbert 4C Capstan Lathe. =A0 No Problem, - sez I,
> >because I also have an old Denbigh Milling Machine, so I put in a
> >suitable tool and tried to reduce the thickness, by slicing a bit off
> >the top. =A0I got a lot of smoke and sparks but very little cutting. =A0I=
> >wonder how I can resharpen one of my slitting saws?!
>
> >The tool holder is pretty obviously hardened. =A0So I rigged up a clamp
> >affair on a heavy duty emery wheel and started to take small grindings
> >off the top of it as the tip of tool has to be about 1/4 of an inch
> >higher to line it up with the centre of the chuck. I have made a
> >spacer to set it correctly, but about 4 hours of grinding, measuring,
> >cooling, grinding, measuring, sweating, swearing, etc. I have only
> >done about half. It's a big toolholder.
>
> >There must be a better way.
>
> >Does anyone know it? =A0Please.
>
> >Thanks George.
>
> Get a couple of the 1mm thick slitting saw wheels for a 4-1/2" angle
> grinder and slice the excess off.
>
> For anyone who hasn't come across these they are bloody brilliant.
> So quick and without all the fuss of grinding everything away.
>
> With a bit of care they are also neat.
> I chopped a 6" square out of a stainless water tank to remove the
> heater element which was spinning.
> Repaired the back and welded the same plate back in the hole.
>
> .- Hide quoted text -
>
> - Show quoted text -
Yes, that might work, however there is a lot of hardened steel to cut
through. The tool is about 7 inches long and at least an inch wide.
I should have tried that before I started grinding down the whole
area. That was what I attempted with a slitting saw on the mill.
I do have a few of the smaller discs, I shall try one of them to see
if it might do the job, this morning. There is quite a difference
between the thickness of a tank and my tool holder! They do wear
quickly when worked hard. Thanks.
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Posted by Dave Baker on March 13, 2008, 5:46 pm
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> At a car boot sale, I found a really heavy duty triangular tool insert
> holder. When I got home, I found that it would not fit in the tool
> post of my huge Herbert 4C Capstan Lathe. No Problem, - sez I,
> because I also have an old Denbigh Milling Machine, so I put in a
> suitable tool and tried to reduce the thickness, by slicing a bit off
> the top. I got a lot of smoke and sparks but very little cutting. I
> wonder how I can resharpen one of my slitting saws?!
>
> The tool holder is pretty obviously hardened. So I rigged up a clamp
> affair on a heavy duty emery wheel and started to take small grindings
> off the top of it as the tip of tool has to be about 1/4 of an inch
> higher to line it up with the centre of the chuck. I have made a
> spacer to set it correctly, but about 4 hours of grinding, measuring,
> cooling, grinding, measuring, sweating, swearing, etc. I have only
> done about half. It's a big toolholder.
>
> There must be a better way.
>
> Does anyone know it? Please.
Take the bulk off using a coarse wheel on a bench grinder and frequent dips
into a water bath. When you're close to final size you can true it up again.
--
Dave Baker
Puma Race Engines
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Posted by John Stevenson on March 13, 2008, 7:42 pm
Please log in for more thread options wrote:
>> The tool holder is pretty obviously hardened. So I rigged up a clamp
>> affair on a heavy duty emery wheel and started to take small grindings
>> off the top of it as the tip of tool has to be about 1/4 of an inch
>> higher to line it up with the centre of the chuck. I have made a
>> spacer to set it correctly, but about 4 hours of grinding, measuring,
>> cooling, grinding, measuring, sweating, swearing, etc. I have only
>> done about half. It's a big toolholder.
>>
>> There must be a better way.
>>
>> Does anyone know it? Please.
>
>Take the bulk off using a coarse wheel on a bench grinder and frequent dips
>into a water bath. When you're close to final size you can true it up again.
That's what he is doing.....
.
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Posted by the wizard on March 13, 2008, 7:42 pm
Please log in for more thread options > At a car boot sale, I found a really heavy duty triangular tool insert
> holder. When I got home, I found that it would not fit in the tool
> post of my huge Herbert 4C Capstan Lathe. =A0 No Problem, - sez I,
> because I also have an old Denbigh Milling Machine, so I put in a
> suitable tool and tried to reduce the thickness, by slicing a bit off
> the top. =A0I got a lot of smoke and sparks but very little cutting. =A0I
> wonder how I can resharpen one of my slitting saws?!
>
> The tool holder is pretty obviously hardened. =A0So I rigged up a clamp
> affair on a heavy duty emery wheel and started to take small grindings
> off the top of it as the tip of tool has to be about 1/4 of an inch
> higher to line it up with the centre of the chuck. I have made a
> spacer to set it correctly, but about 4 hours of grinding, measuring,
> cooling, grinding, measuring, sweating, swearing, etc. I have only
> done about half. It's a big toolholder.
>
> There must be a better way.
>
> Does anyone know it? =A0Please.
>
> Thanks George.
Hi George
When I had the same problem with a toolholder, I was able to use the
bandsaw to remove the excess, then use an end mill to clean up the
surface. It seems it was only case hardened, so by sawing off the
bottom I only had to go through two thin layers and a soft(?) core,
rather than get though a large amount of hard.
As they say "it works for me"
T.W.
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Posted by Peter Neill on March 14, 2008, 3:56 am
Please log in for more thread options On Thu, 13 Mar 2008 13:21:42 -0700 (PDT), George
>At a car boot sale, I found a really heavy duty triangular tool insert
>holder. When I got home, I found that it would not fit in the tool
>post of my huge Herbert 4C Capstan Lathe. No Problem, - sez I,
>because I also have an old Denbigh Milling Machine, so I put in a
>suitable tool and tried to reduce the thickness, by slicing a bit off
>the top. I got a lot of smoke and sparks but very little cutting. I
>wonder how I can resharpen one of my slitting saws?!
>
>The tool holder is pretty obviously hardened. So I rigged up a clamp
>affair on a heavy duty emery wheel and started to take small grindings
>off the top of it as the tip of tool has to be about 1/4 of an inch
>higher to line it up with the centre of the chuck. I have made a
>spacer to set it correctly, but about 4 hours of grinding, measuring,
>cooling, grinding, measuring, sweating, swearing, etc. I have only
>done about half. It's a big toolholder.
>
>There must be a better way.
>
>Does anyone know it? Please.
>
>Thanks George.
Use a solid carbide end mill.
I bought a bunch of these, 16mm dia all used, cheaply from e-bay about
2 years ago. Had them resharpened locally for very little money, and I
keep them in a draw for jobs such as these.
Will cut hardended steel very easily.
Peter
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