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Depends on the mower. Most newer commercial mowers don't key the blade to
the shaft at all. Instead they use friction washers to keep them
spinning. That way if you hit something the washers can slip and absorb
the impact instead of damaging something. This approach does require
sturdier spindle bearings to deal with the increased vibration when the
blades are out of time. But they quickly slip the betts re-sync
themselves.
On Tue, May 18, 2021 at 8:45 PM Thomas Coradeschi <tjcora@icloud.com> wrote=
:
> As others have noted, I can=E2=80=99t imagine any reason why it would mak=
e a
> difference. Multiple blade mowers require you to pay attention to that, f=
or
> obvious reasons. My old Troy Bilt had keyed hubs and a cogged belt drivin=
g
> them, so that was easy (as long as you didn=E2=80=99t dork up replacing t=
he cogged
> belt). My current Exmark requires you to actually think about the blade
> orientations when you install them:-)
>
> =E2=80=94
> Tom Coradeschi
> tjcora@icloud.com
>
>
> > On 18 May 2021, at 5:52 PM, Karl Vacek <stearman809@gmail.com> wrote:
> >
> > Last time I sharpened my 21=E2=80=9D walk-behind mower blade I thought =
of
> something that=E2=80=99s never occurred to me, after using the same brand=
of mower
> for 25 years..
> >
> > On a Snapper, the blade can actually go on any way onto the square
> adapter keyed to the crankshaft. The mounting point is square, no pins, =
no
> longer side, nothing.
> >
> > One way would be aligned with the cylinder at TDC/BDC, and the other wa=
y
> would be across. It=E2=80=99s been off many times and there=E2=80=99s no=
way to tell how
> it was mounted originally. The manual is silent on this.
> >
> > Power stroke shouldn=E2=80=99t matter, but maybe some dynamic issue one=
way or
> the other?
> >
> > Thanks!
> > Karl
> > _______________________________________________
> >
> > Shop-talk@autox.team.net
> > Donate: http://www.team.net/donate.html
> > Suggested annual donation $12.96
> > Archive: http://www.team.net/pipermail/shop-talk
> http://autox.team.net/archive
> >
> > Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/tjcora@icloud.com
>
> _______________________________________________
>
> Shop-talk@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.96
> Archive: http://www.team.net/pipermail/shop-talk
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>
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>
>
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=3D=3D=3D=3D=3D=3D=3D=3D
=3D Never offend people with style when you =3D
=3D can offend with substance --- Sam Brown =3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
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<div dir=3D"ltr">Depends on the mower.=C2=A0 Most newer commercial mowers d=
on't key the blade to the shaft at all.=C2=A0 Instead they use friction=
washers to keep them spinning.=C2=A0 That way if you hit something the was=
hers can slip and absorb the impact instead of damaging something.=C2=A0 Th=
is approach does require sturdier spindle bearings to deal with the increas=
ed vibration when the blades are out of time.=C2=A0 But they quickly slip t=
he betts re-sync themselves.=C2=A0=C2=A0<br></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, May 18, 2021 at 8:45 PM=
Thomas Coradeschi <<a href=3D"mailto:tjcora@icloud.com";>tjcora@icloud.c=
om</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
">As others have noted, I can=E2=80=99t imagine any reason why it would mak=
e a difference. Multiple blade mowers require you to pay attention to that,=
for obvious reasons. My old Troy Bilt had keyed hubs and a cogged belt dri=
ving them, so that was easy (as long as you didn=E2=80=99t dork up replacin=
g the cogged belt). My current Exmark requires you to actually think about =
the blade orientations when you install them:-)<br>
<br>
=E2=80=94<br>
Tom Coradeschi<br>
<a href=3D"mailto:tjcora@icloud.com"; target=3D"_blank">tjcora@icloud.com</a=
><br>
<br>
<br>
> On 18 May 2021, at 5:52 PM, Karl Vacek <<a href=3D"mailto:stearman8=
09@gmail.com" target=3D"_blank">stearman809@gmail.com</a>> wrote:<br>
> <br>
> Last time I sharpened my 21=E2=80=9D walk-behind mower blade I thought=
of something that=E2=80=99s never occurred to me, after using the same bra=
nd of mower for 25 years..<br>
>=C2=A0 <br>
> On a Snapper, the blade can actually go on any way onto the square ada=
pter keyed to the crankshaft.=C2=A0 The mounting point is square, no pins, =
no longer side, nothing.<br>
>=C2=A0 <br>
> One way would be aligned with the cylinder at TDC/BDC, and the other w=
ay would be across.=C2=A0 It=E2=80=99s been off many times and there=E2=80=
=99s no way to tell how it was mounted originally.=C2=A0 The manual is sile=
nt on this.<br>
>=C2=A0 <br>
> Power stroke shouldn=E2=80=99t matter, but maybe some dynamic issue on=
e way or the other?<br>
>=C2=A0 <br>
> Thanks!<br>
> Karl<br>
> _______________________________________________<br>
> <br>
> <a href=3D"mailto:Shop-talk@autox.team.net"; target=3D"_blank">Shop-tal=
k@autox.team.net</a><br>
> Donate: <a href=3D"http://www.team.net/donate.html"; rel=3D"noreferrer"=
target=3D"_blank">http://www.team.net/donate.html</a><br>
> Suggested annual donation=C2=A0 $12.96<br>
> Archive: <a href=3D"http://www.team.net/pipermail/shop-talk"; rel=3D"no=
referrer" target=3D"_blank">http://www.team.net/pipermail/shop-talk</a> <a =
href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" target=3D"_blank"=
>http://autox.team.net/archive</a><br>
> <br>
> Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/s=
hop-talk/tjcora@icloud.com" rel=3D"noreferrer" target=3D"_blank">http://aut=
ox.team.net/mailman/options/shop-talk/tjcora@icloud.com</a><br>
<br>
_______________________________________________<br>
<br>
<a href=3D"mailto:Shop-talk@autox.team.net"; target=3D"_blank">Shop-talk@aut=
ox.team.net</a><br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk"; rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/shop-talk</a> <a href=
=3D"http://autox.team.net/archive"; rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/archive</a><br>
<br>
alk/jdinnis@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.te=
am.net/mailman/options/shop-talk/jdinnis@gmail.com</a><br>
<br>
</blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D"ltr" class=3D"g=
mail_signature">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>=3D Never offend people with =
style when you=C2=A0=C2=A0 =3D<br>=3D can offend with substance --- Sam Bro=
wn=C2=A0 =3D<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div>
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_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive
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