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Posted by mark@ems-fife.co.uk on February 20, 2008, 3:42 pm
Please log in for more thread options > Since you are all bored -
>
> PolyModels have sent me a very nice casting, =A0a 9 and a bit inch flywhee=
l
> for my stationary steam engine project (none of that Stuart Turner wimp
> stuff here). =A0 I don't want to turn a nice casting into scrap so would
> appreciate someone checking my production planning:
>
> a) Mount face plate on lathe and lock three bolts into the face plate
> 120degrees apart to support the rim of the wheel
> b) Skim off the tops of the bolts so they are "true".
> c) Clamp the casting down onto the bolts, =A0truing the flywheel to the ri=
m
> d) Skim top and front side of rim
> e) Skim front of hub
> f) =A0Remove flywheel, turn over, mount true using top face of rim as datu=
m
> g) Skim front face of rim
> h) Face hub, drill and ream to size
>
> My book is suggesting about 25rpm (very boring) with carbide tooling - I c=
an
> do 25rpm, =A0what do you reckon is optimum to get through the skin with a
> reasonable finish?
>
> Just planning on skimming the casting so it is square and removed the
> casting marks, =A0nothing more.
>
> How do you balance a flywheel? =A0Haven't a clue how fast this will be tur=
ning
> at full chat -
You don`t want to do B and C.If you pull the casting down onto the
bolts it will distort and when you release it after machining it will
not be true.
You need to shim under it so that when you clamp it it will not be
getting distorted.
Once you have it clamped machine as much as you can in one setting
including the bore.
If I had to do something like that in a small machine,I would lay the
faceplate on the surface table and use a height gauge while shimming
to ensure it stays level within the machining allowances you have and
when clamping set a dial indicator on the top of the casting adjacent
to the clamp to check it was not getting distorted while I clamped
it.Centralise by measuring with a rule.
The 25 rpm seems very slow but I don`t use small machines so won`t
comment.
Mark.
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>
> PolyModels have sent me a very nice casting, a 9 and a bit inch flywheel
> for my stationary steam engine project (none of that Stuart Turner wimp
> stuff here). I don't want to turn a nice casting into scrap so would
> appreciate someone checking my production planning:
>
> a) Mount face plate on lathe and lock three bolts into the face plate
> 120degrees apart to support the rim of the wheel
> b) Skim off the tops of the bolts so they are "true".
> c) Clamp the casting down onto the bolts, truing the flywheel to the rim
> d) Skim top and front side of rim
> e) Skim front of hub
> f) Remove flywheel, turn over, mount true using top face of rim as datum
> g) Skim front face of rim
> h) Face hub, drill and ream to size
>
> My book is suggesting about 25rpm (very boring) with carbide tooling - I
> can do 25rpm, what do you reckon is optimum to get through the skin with
> a reasonable finish?