Jurassic Park Playfield Rubber Kit
ikrananka
A while back I purchased a JP rubber ring kit in preparation for an
overhaul of my JP. Well, it took me over six months to getting round to
the overhaul and it is now finally complete. The rubber ring kit turned
out to be full of errors compared to what had been installed on the
playfield before. Comparing the kit I received to the JP manual
confirmed that the kit was a direct copy of the rubber rings listed in
the manual. The problem is that the manual's listing is seriously
flawed and most certainly based around an early design of the playfield
e.g. there is a 2 3/4" ring shown directly in front of the T-Rex which
is not in any of the commercial run machines that I have seen.
Not only are there differences between the machine and manual, but
there are errors in some sizes and also some posts with rubbers were
added to production machines that are not shown in the manual.
I worked through these errors and differences and have marked up what I
believe to be the correct kit for a JP machine (refer to attached pdf).
I say that I believe this is correct due to the fact that I have seen
photos of a FEW JPs with some differences to what I believe is correct.
I have attached my proposed marked-up "kit" for your info and would
appreciate any feedback.
I have colour coded the rubbers as follows:
Green = same as manual
Blue = different size to manual
Red = additional post and rubber not shown in manual
Areas of most significant difference are:
1. The D-E-E grouping above the left out/in-lane. The manual states
that this should be a single 1 1/2" (I) ring - but this is way too baggy
when installed (as is a 1 1/4" rubber). So an alternative might be a 1"
ring. Comments welcome.
2. The I ring to the left of the top pop bumper. The manual states
that this should be a 1 1/4" (H) ring. However, I found that this is
way too tight and therefore should be at least a 1 1/2" (I) ring.
3. The posts at the top of the in/out-lane dividers. The manual shows
these as being 3/16" ID rings which is fundamentally wrong for the post
type. I have selected 3/8" OD rings which are a perfect fit.
4. Many of the Post Rubbers (B) are not installed and in most of these
cases cannot be installed due to the type of post at that location.
That said there are several locations where additional 'B' type rubbers
could be installed but I have omitted them due to my machine not having
them when I received it and photos of other machines also not showing
them installed.
Much appreciate any constructive comments/feedback.
Filename:-----------> Jurassic Park Playfield Rubber Parts Kit.pdf
Link to attached PIC: http://rgparchive.com/rgpforum/attachment.php?attachmentid=91
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ikrananka
This USENET post sent from http://rgparchive.com
James - ShacklersRevenge
amusments fault, I brought it up that i ordered the kit from
BAYAREAAMUSEMENTS On rgp, the owner e-mailed me, I told him the random
pieces that were missing and he never sent anything or e-mailed back.
Dumb me, but I still order from them because I like their products and
fast shipping :)
James
ikrananka
rubbers were completely missing despite being listed in the manual and
the BAA kit list enclosure.
ikrananka
Referring to Jeff's reply at
http://rgparchive.com/rgpforum/showpost.php?p=1596594&postcount=4.
> The triangle of posts
> near the left outlane can be setup with one rubber around all three
> posts, or with one rubber around the two star posts, and an individual
> ring on the adjustable post. I've tried it both ways and see little
> difference in play, but I think the single ring looks best.
I have seen examples with one rubber around all three posts and
individual rubbers around each post. I have not seen it the way you've
described with one rubber around the two star posts and one around the
adjustable. As you say, it makes little difference to gameplay so no
big deal. The contradictory manual shows in the illustration a single
rubber around all three posts - but this then (i) makes the adjustable
post difficult to adjust without removing the rubber and (ii) makes the
rubber tension variable depending upon the adjustable post position.
Surely it is undesireable to experience the latter issue which will
affect gameplay. So I believe that a single rubber around the
adjustable posts must be the most appropriate way to go.
> I
> Currently have the right side in-line trio of posts set up with a ring
> around the two star posts and a second ring on the adjustable post,
> but I may try using a single ring as I did on the left side.
>
I have a single rubber around the three posts and this encompasses the
adjustable post. But as I said above, I don't believe that this can be
the right way to go due to the variability in rubber tension depending
in the adjustable post's location. I may well change mine to your
config with a single rubber around the two star posts and another around
the adjustable post. What size ring did you use for the two star
posts?
> I also went with 2-1/2" rings on the slingshots because that's what I
> had on hand. They are slightly tighter than the 2-3/4" rings would
> be, but they seem fine to me.
>
From what I understand in most situations a ring +/- 1/4" is quite
acceptable (certainly for the larger ring sizes).
Curious to know what you did with the topmost left side ring - the one
furthest up the Visitor's Centre. I used a 1 1/2" ring - the 1 1/4"
ring just seemed to be too stretched.
Loki9
ikrananka;1596891 Wrote:
> Referring to Jeff's reply at
> http://rgparchive.com/rgpforum/showpost.php?p=1596594&postcount=4.
>
>
>
> individual rubbers around each post. I have not seen it the way you've
> described with one rubber around the two star posts and one around the
> adjustable. As you say, it makes little difference to gameplay so no
> big deal. The contradictory manual shows in the illustration a single
> rubber around all three posts - but this then (i) makes the adjustable
> post difficult to adjust without removing the rubber and (ii) makes the
> rubber tension variable depending upon the adjustable post position.
> Surely it is undesireable to experience the latter issue which will
> affect gameplay. So I believe that a single rubber around the
> adjustable posts must be the most appropriate way to go.
Point taken, but I don't adjust those posts often and I can always
change the rubber if I do move the post.
>
> I have a single rubber around the three posts and this encompasses the
> adjustable post. But as I said above, I don't believe that this can be
> the right way to go due to the variability in rubber tension depending
> in the adjustable post's location. I may well change mine to your
> config with a single rubber around the two star posts and another around
> the adjustable post. What size ring did you use for the two star
> posts?
>
1" IIRC
>
> Curious to know what you did with the topmost left side ring - the one
> furthest up the Visitor's Centre. I used a 1 1/2" ring - the 1 1/4"
> ring just seemed to be too stretched.
I have a 1-1/4" on there. It is tight, but I think this is good as it
takes a beating from the bumper and there isn't any space behind it.
I'd worry that with a larger ring the bumper will be beating the ball
into the wire stop behind the rubber. Also, with a larger ring the left
orbit shot is harder to make and it is plenty difficult already.
-Jeff
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Loki9