[TheForge] cast iron - Little Giant pulley
Cameron Stoker
[email protected]
Fri Aug 9 13:24:01 2002
I just got done upgrading the belt system used on my #50 LG hammer. I =
had=20
machined a 2.5" flat belt pulley, and used the flat canvas belt for =
quite=20
a while, but I could never get it to stay on when the belt got oily=20
(inevitable on a lg). I got so sick of it that I changed to a=20
synchronous drive belt system (timing belt and pulley). You can order =
the=20
belt and pulley from mcmastercarr.com for about $60.
I went with a 1.5" wide belt with 1/2" pitch teeth and a pulley (H =
series,
16T, 2.8" o.d.), with double flanges for the motor, the belt just runs =
on=20
the flats of the teeth on the spider of the l.g.
It made a huge difference on my hammer - I think the flat belt had =
always=20
slipped a little on the small motor pulley. In theory this setup gives =
my=20
hammer about 400rpm. Is this too fast? Seems to work better than it ever=20=
did with a 2.5" pulley on the motor.
I think I have a photo of it around here - I'll see if I can post it =
soon.
Now I just have to tune up the clutch blocks on the hammer - I heard a=20=
good trick was to replace the hardwood blocks with chunks of UHMWPE=20
(ultra-high molecular weight polyethylene). They run smooth, and don't=20=
require that just right amount of oiling the wood blocks do.
Also, I've been thinking of making some new hammer dies from a36 and =
then=20
casehardening them with casenite. Has anyone tried this? I worry that =
the=20
case won't do much to stop the die from deforming deeper down in the =
body=20
of the die. I can't really afford $250-$350 per set of dies, and it is a=20=
real pain to machine tool steel on my 3-in-1 mill.
On Friday, August 9, 2002, at 10:05 AM, Gladish Family wrote:
> It's a cast iron 5 spoke pulley that somebody welded on, maybe in =
hopes=20
> that
> they could use a 3450 motor.
> I have a 1725 with a 2" pulley, the original LG pulley is 10" which =
is
> about right but the add-on makes it 13".
> 2 to 10 is 5x reduction, 345 beats per minute, a bit slow, but the 2"=20=
> pulley
> is really about 1 3/4 with the belts it's got.
> 2 to 13 is 265 bpm which is about what it's running (counting beats =
for
> fifteen seconds, x 4) and it won't strike well at "full speed" because =
it'
> s
> not cycling at full speed. The outer pulley's got to go. Its not very =
well
> balanced, either- you can see that the inner (original) is running =
true=20
> and
> the outer is wobbling. The babbitt it rides on will have to be =
re-poured,
> too, since the wobble made it old before its time.
> Thanks, Peter- I'd forgotten about cutting with the welder since I got =
all
> these other tools ;-)
> Worth a try, since I'm going by Sid's soon.
> Andy G.
>
>> First, I doubt this pulley is making your unit run slow. It does add=20=
>> mass
>> and would affect startup but otherwise it would work as a flywheel.
>>
>> If this pulley is mounted between the bearings and you see a wobble,
>> something more serious may be the problem. It may be your shaft
>> is not true
>> and you can see the affect on the pulley.
>>
>> Is this a flat belt pulley mounted on the top shaft outside the =
bearings?
>>
>> What are you cutting, the shaft or are you cutting up the pulley?
>>
>> If this pulley is mounted on the outside, you can use a puller to
>> remove it.
>> If it's mounted between the bearings, you can remove the shaft
>> and then take
>> off the pulley and check your shaft.
>>
>> I think it will be easier to remove the whole pulley as a unit rather=20=
>> than
>> cutting it off. It would be better if you remove it all rather than =
just
>> the spokes and rim.
>>
>> Walt
>>
>>
>> -----Original Message-----
>> From: Gladish Family <[email protected]>
>> To: Theforge@Mailman. Qth. Net <[email protected]>
>> Date: Friday, August 09, 2002 1:41 AM
>> Subject: [TheForge] cast iron
>>
>>
>>> Anybody got the secret to cutting cast iron?
>>> Somebody back in the ancient mists of time added a dorky outer
>> pulley to my
>>> Little Giant, causing it to wobble and run too slow. I tried to
>> cut it off
>>> of there with the torch and it looked like it was going to make
>> a mess, and
>>> the sawzall isn't working either...
>>> Andy G
>>>
>>> No matter what happens, somebody will find a
>>> way to take it too seriously.
>>> Dave Barry
>>>
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>>>
>>
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>
> _______________________________________________
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>
Cameron Stoker
"May you run like a vicu=F1a!"
[email protected]