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Old Mar 21, 2005, 06:11 PM
Adrian Godwin
Guest
n/a Posts
Rapidor hacksaw

I'm repairing a Rapidor hacksaw that's been neglected for a few years.
I don't know what model it is, but the blade is 14" x 1" and several
of the castings have numbers like '3XM3' or '3XM4' on them.

It's in surprisingly good condition under the dirt and leaves (nothing
really seized up) but I'm confused about the dashpot mechanism.

The dashpot itself is straightforward - a piston with holes in it, and
a spring-loaded washer to shut the holes as the piston is pushed into
the dashpot. But there's a length of 1/4" rod screwed into the piston
that runs parallel to the square shaft. It's about 6" long, has a
short knurled length, then just stops, bent and ragged.

The main cam that drives the saw also has some wear, as though a
cam-follower once rode on it. There's an empty boss in the base
casting, directly under the edge of this cam. I suspect there's
something missing here, perhaps a hydraulic lifter that's connected
in some way with that 1/4" rod. Anyone know how it's supposed to
work ? It's a long while since I last used a well-maintained one.


Another puzzle is the vice : when it's tightened, the jaws are pulled
together nicely. But when the crank is loosened, the thread doesn't
drive the jaws apart : instead, the crank winds out of the front jaw
and a tap on the end is needed to move the jaws apart. Is this right,
or should there be a pin somewhere to keep the crank in place ?


-adrian
Old Mar 22, 2005, 06:11 AM
Prepair Ltd
Guest
n/a Posts
Re: Rapidor hacksaw

On Mon, 21 Mar 2005 22:42:06 +0000, Adrian Godwin
<adrian.110504@ntlworld.com> wrote:

>I'm repairing a Rapidor hacksaw that's been neglected for a few years.
>I don't know what model it is, but the blade is 14" x 1" and several
>of the castings have numbers like '3XM3' or '3XM4' on them.
>
>It's in surprisingly good condition under the dirt and leaves (nothing
>really seized up) but I'm confused about the dashpot mechanism.
>
>The dashpot itself is straightforward - a piston with holes in it, and
>a spring-loaded washer to shut the holes as the piston is pushed into
>the dashpot. But there's a length of 1/4" rod screwed into the piston
>that runs parallel to the square shaft. It's about 6" long, has a
>short knurled length, then just stops, bent and ragged.
>
>The main cam that drives the saw also has some wear, as though a
>cam-follower once rode on it. There's an empty boss in the base
>casting, directly under the edge of this cam. I suspect there's
>something missing here, perhaps a hydraulic lifter that's connected
>in some way with that 1/4" rod. Anyone know how it's supposed to
>work ? It's a long while since I last used a well-maintained one.
>
>
>Another puzzle is the vice : when it's tightened, the jaws are pulled
>together nicely. But when the crank is loosened, the thread doesn't
>drive the jaws apart : instead, the crank winds out of the front jaw
>and a tap on the end is needed to move the jaws apart. Is this right,
>or should there be a pin somewhere to keep the crank in place ?
>
>
>-adrian


We also have a 14" blade Rapidor, we can do some pic's of specific
items if you need them. Our vice also does that!


Peter
--
Peter A Forbes
Prepair Ltd, Luton, UK
prepair@easynet.co.uk
http://www.prepair.co.uk
Old Mar 22, 2005, 08:11 AM
Adrian Godwin
Guest
n/a Posts
Re: Rapidor hacksaw

Prepair Ltd <prepair@easynet.co.uk> wrote:
>
> We also have a 14" blade Rapidor, we can do some pic's of specific
> items if you need them. Our vice also does that!
>
>


The one at the bottom of this page ? :-)

http://www.oldengine.org/members/diesel/Ward/adcock.htm

That's pretty well identical, though I wasn't sure of the size.
Except yours has a weight, stand, motor, and has had a lot more
elbow grease applied !

I think Mike's sorted out my biggest problem, but a pic of the top
of the dashpot would still be interesting, thanks. And do you have
a boss (or even just a hole) in the tray directly underneath the
cam / flywheel ?


-adrian
Old Mar 22, 2005, 08:11 AM
Roland and Celia Craven
Guest
n/a Posts
Re: Rapidor hacksaw

Mine has such a hole. Since it had a pipe fitting screwed into it I assumed
it to be the coolant drain. Whatever; that's what it gets used for..
hth
--
Roland Craven
nr Exeter Devon, UK
roland@petternut.co.uk
http://www.petternut.co.uk

"Adrian Godwin" <adrian.110504@ntlworld.com> wrote in message
news:m0h5h2-bdq.ln1@smaug.toynbee.org.uk...
>>

> I think Mike's sorted out my biggest problem, but a pic of the top
> of the dashpot would still be interesting, thanks. And do you have
> a boss (or even just a hole) in the tray directly underneath the
> cam / flywheel ?



Old Mar 22, 2005, 08:11 AM
Prepair Ltd
Guest
n/a Posts
Re: Rapidor hacksaw

On Tue, 22 Mar 2005 12:52:06 +0000, Adrian Godwin
<adrian.110504@ntlworld.com> wrote:

>Prepair Ltd <prepair@easynet.co.uk> wrote:
>>
>> We also have a 14" blade Rapidor, we can do some pic's of specific
>> items if you need them. Our vice also does that!
>>
>>

>
>The one at the bottom of this page ? :-)
>
> http://www.oldengine.org/members/diesel/Ward/adcock.htm


Yup, that's the one.

>That's pretty well identical, though I wasn't sure of the size.
>Except yours has a weight, stand, motor, and has had a lot more
>elbow grease applied !


Mad Mick Mills did the work, I bought it from him after he had been
over it and sorted it out.

>I think Mike's sorted out my biggest problem, but a pic of the top
>of the dashpot would still be interesting, thanks. And do you have
>a boss (or even just a hole) in the tray directly underneath the
>cam / flywheel ?


See Roly's reply, but I will check mine as well tonight and take a
pic.

>
>-adrian


Peter

Peter
--
Peter A Forbes
Prepair Ltd, Luton, UK
prepair@easynet.co.uk
http://www.prepair.co.uk
Old Mar 22, 2005, 08:11 PM
Adrian Godwin
Guest
n/a Posts
Re: Rapidor hacksaw

Roland and Celia Craven <roland@petternut.co.uk> wrote:
> Mine has such a hole. Since it had a pipe fitting screwed into it I assumed
> it to be the coolant drain. Whatever; that's what it gets used for..
> hth


Possibly not the same as mine, then - the base casting has a wall just
behind the dashpot, and the hole I mean is behind that, only a few
inches from the back. This area would tend to collect spilled oil from
the mechanism, so is best kept apart from the suds. The coolant
couldn't drain to there without also flowing onto the floor. The boss
might well be part of a pipe fitting, but I haven't taken it apart
yet.

There is, however, another hole just in front of the dashpot :
this would drain fine. But on my model, it doesn't have any
sort of fitting.

This machine looks as though it was n production for a long
while - there must be a lot of variations about, especially
in such things as motor mount and coolant pumps.

-adrian
Old Mar 23, 2005, 02:11 PM
Jez
Guest
n/a Posts
Re: Rapidor hacksaw

Adrian Godwin wrote:
> I'm repairing a Rapidor hacksaw that's been neglected for a few years.
> I don't know what model it is, but the blade is 14" x 1" and several
> of the castings have numbers like '3XM3' or '3XM4' on them.
>
> It's in surprisingly good condition under the dirt and leaves (nothing
> really seized up) but I'm confused about the dashpot mechanism.
>
> The dashpot itself is straightforward - a piston with holes in it, and
> a spring-loaded washer to shut the holes as the piston is pushed into
> the dashpot. But there's a length of 1/4" rod screwed into the piston
> that runs parallel to the square shaft. It's about 6" long, has a
> short knurled length, then just stops, bent and ragged.
>
> The main cam that drives the saw also has some wear, as though a
> cam-follower once rode on it. There's an empty boss in the base
> casting, directly under the edge of this cam. I suspect there's
> something missing here, perhaps a hydraulic lifter that's connected
> in some way with that 1/4" rod. Anyone know how it's supposed to
> work ? It's a long while since I last used a well-maintained one.
>
>
> Another puzzle is the vice : when it's tightened, the jaws are pulled
> together nicely. But when the crank is loosened, the thread doesn't
> drive the jaws apart : instead, the crank winds out of the front jaw
> and a tap on the end is needed to move the jaws apart. Is this right,
> or should there be a pin somewhere to keep the crank in place ?
>
>
> -adrian


Hello Adrian,

The boss in the base under the cam is for a suds pump. Mine is
currently siezed...

I can take some pictures of it if you like - let me know...


Cheers,

Jez.


jez[AT]jez[HYPHEN]nikki[DOT]net
Old Mar 23, 2005, 06:11 PM
Adrian Godwin
Guest
n/a Posts
Re: Rapidor hacksaw

Jez <invalid@invalid.invalid> wrote:

>
> The boss in the base under the cam is for a suds pump. Mine is
> currently siezed...
>
> I can take some pictures of it if you like - let me know...


Yes please !
Or even just a written description - I can imagine a spring
plunger and valve arrangement but approximate dimensions
would be interesting.

-adrian
Old Mar 25, 2005, 02:11 PM
BigEgg
Guest
n/a Posts
Re: Rapidor hacksaw


>>Another puzzle is the vice : when it's tightened, the jaws are pulled
>>together nicely. But when the crank is loosened, the thread doesn't
>>drive the jaws apart : instead, the crank winds out of the front jaw
>>and a tap on the end is needed to move the jaws apart. Is this right,
>>or should there be a pin somewhere to keep the crank in place

>
>
> We also have a 14" blade Rapidor, we can do some pic's of specific
> items if you need them. Our vice also does that!


I was given a machine vice which had the same problem - there was a slot
on the threaded rod, just inside the casing, which I think should have
had a circlip on it (or something).
I couldn't get a circlip on (not enough clearance for pliers) so I
wrapped a couple of turns of thin wire into the groove. It's worked OK
for a couple of years now.

--
BigEgg
 


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