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Posted by Austin Shackles on May 1, 2008, 2:42 am
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On or around Wed, 30 Apr 2008 14:11:53 -0700 (PDT), mark
>
>
>YEAH right ....."TOY"
>
>and to blinking fast .
too fast for this job, but handy for drilling small stuff, which is mainly
what it's for, and it was cheap.
I can address "too fast" as well, given time - I looked at it and there's
scope to make an idler pulley mount in the middle of the belt case, there
are even mounting holes for it. But not today. I'll look into that when I
have time and put a double belt on.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Travel The Galaxy! Meet Fascinating Life Forms...
------------------------------------------------
>> http://www.schlockmercenary.com/ << ...and Kill them.
a webcartoon by Howard Tayler; I like it, maybe you will too!
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Posted by John on May 1, 2008, 11:11 am
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> The big machine
> that goes slowly doesn't have enough overhang.
>
Can you tie a strap around the tyre and pull it towards the rim to
clear the drill pillar?
Ratchet tie down straps work well for this sort of thing.
John
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Posted by Austin Shackles on May 1, 2008, 4:17 pm
Please log in for more thread options On or around Thu, 1 May 2008 08:11:15 -0700 (PDT), John
>
>
>> The big machine
>> that goes slowly doesn't have enough overhang.
>>
>Can you tie a strap around the tyre and pull it towards the rim to
>clear the drill pillar?
>Ratchet tie down straps work well for this sort of thing.
did it in 2 stages, got the rims, machined 'em, which went very nicely at 90
rpm, didn't even run warm without coolant, then took 'em back to get tyres
on 'em.
The ratchet strap idea wouldn't have worked - there was only about an inch
or two of clearance from the rim to the pillar.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Travel The Galaxy! Meet Fascinating Life Forms...
------------------------------------------------
>> http://www.schlockmercenary.com/ << ...and Kill them.
a webcartoon by Howard Tayler; I like it, maybe you will too!
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Posted by Peter on April 30, 2008, 4:41 pm
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>
> What's a typical cutting speed for (assumed) mild steel, using an HSS
> tool?
A good rule of thumb, and easy to remember, is 100mm dia -> 100 RPM
Then 50mm dia -> 200 RPM etc
Likewise, double the RPM for brass, halve for exotics ...
> I've got some steel van wheels on which I need to put chamfers on the
> holes.
> I've got a 90 degree 6-flute cutter, but I'm wondering what speed I can
> run
> it.
Well, i'd use a chamfering tool, which is just a triangular-shaped
normal lathe tool (triangle looking down from the top) with a flat
top.
Speed say about a third 'normal', just a bit faster than parting.
If you use the 6-flute cutter, i'd think it would need to be VERY slow,
Hope that helps,
Peter
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Posted by mark on April 30, 2008, 4:59 pm
Please log in for more thread options On Apr 30, 7:26=A0pm, Austin Shackles
> What's a typical cutting speed for (assumed) mild steel, using an HSS tool=
?
>
> I've got some steel van wheels on which I need to put chamfers on the hole=
s.
> I've got a 90 degree 6-flute cutter, but I'm wondering what speed I can ru=
n
> it. =A0The drill which will be easiest to use only goes down to about 450r=
pm.
> To use the big drill (which will run slower) I have to do the work with th=
e
> tyres off, which makes it more hassle.
>
> I don't know that they're mild steel, mark you. =A0But I doubt they're
> anything exotic.
> --
> Austin Shackles. =A0www.ddol-las.net=A0my opinions are just that
> Travel The Galaxy! =A0Meet Fascinating Life Forms...
> ------------------------------------------------ =A0
> =A0 =A0>> =A0http://www.schlockmercenary.com/=A0<< =A0 =A0 =A0 =A0...and =
Kill them.
> a webcartoon by Howard Tayler; I like it, maybe you will too!
Good countersink bits are expensive to buy
and wont last long, if turned at 450 rpm ....
Turn them at below 100 rpm, with rtd fluid to lube .and they will last
a long time .
all the best..markj
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>
>YEAH right ....."TOY"
>
>and to blinking fast .