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Dr_C

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Dr_C

293 posts

The unmodified curved lane changers work perfectly with the APB where both lanes have the same digital signal polarities. With the ARC PRO the signal polarities of lane 1 and lane 2 have been reversed. The slot forum mod to the ARC PRO rectifies this polarity reversal by switching two wires so that unmodified curve lane changers will function in digital mode exactly as per the APB. My proposed Option C will also rectify this polarity reversal and so, again, unmodified curve changers will function in digital mode exactly as per the APB. I therefore firmly disagree with your assertion that the only solution is the modification of the curved lane changers. This is simply one of a number of compatibility options. In earlier posts I list three... A, B and C.

Dr_C

293 posts

My position is that there are three valid options and they all work well with various trade offs. In terms of my option C it will work very well in digital mode. Removing the modified track pieces returns the system to an entirly standard ARC PRO format which of course is well suited to analog mode (so long as any curved lane changers have been snipped with the standard digital to analog mod). This is a potential advantage over the slotforum ARC PRO mod which would cause cars to run in opposite direction in analog mode. But just to reiterate...  I’m not yet coming down in favour of any one specific option at this stage.... in fact I’ll be exploring all three options... with the intention of seeking to demonstrate useful and effective modifications in each case :-)

Dr_C

293 posts

Option C

modify two standard track pieces as below and then fit both sides of an unmodified ARC pro...

======= lane1

===X=== lane2

create a10mm dead zone in both rails at point X then ‘cross-wire‘ underneath using two jumper wires. Easy...

Dr_C

293 posts

Yes i see where you are coming from... for option C the modified track pieces enable an unmodified ARC pro to function with unmodified curved lane changers and unmodified digital lap counters. This is intended primarily as a digital solution where integration with unmodified curve lane changers is desiredd. If you want analog too, then can either remove the two option C track pieces, or with a bit of design effort could use double-pole double-throw switches on the track pieces themselves - it’s all very do-able... and I hope this helps...

Dr_C

293 posts

I avoid the risk of the small piece moving by cutting it to align precisely with the retaining tab so it can’t move along the track once the tab has been re-locked. I use 5 min epoxy to hold the three sections of rail in place - but I only use the epoxy in close proximity to the cut positions. The result looks almost like a mass produced part... ;-)

Dr_C

293 posts

Yep - released the tabs on the back and then the rail easily lifts off - and if careful you can cut the rail without deforming it. And yes... one wire jumper required for the curve changer mod. This too could be done when the rail is removed to avoid the risk of melting/deforming the plastic track. We now have evidence that all three of the earlier discussed options will achieve compatibility, i.e.

Option A: modify the Arc Pro as per recent slotforum post 

Option B: modify curved lane changer as per your description above.

Option C: modify standard track sections on either side of the ARC Pro. This involves making dead spots in one of the lanes and then using jumpers to create a cross-over between the two rails of that lane. Electrically this is the same as Option A.

Dr_C

293 posts

I just modified a track section to introduce a dead spot... got a very neat result by lifting the rail then cutting with a dremmel. I cut out a 10mm section then filed each remaining piece back by 1mm then re-assembled all three pieces... this creates... track then 1mm gap then 10mm track with dead spot then another 1mm gap then the remaining section of track. This looks very tidy, isolates the track and creates a nice flush surface for the brushes to ride over... this approach should work very well alongside the fixed output flipper/wedge as per above discussion...

Dr_C

293 posts

Great work modding the curved lane changers!!! And nice photos too! Meanwhile i have modded standard 1/4 length straigh sections to go either side of the ARC pro to enable compatibility between the ARC pro and standard curved lane changers (i.e. my earlier option C) - i’ll test at the weekend once my new power base arrives. As a collective efford we are making great progress...

Dr_C

293 posts

Ok I now understand what those clever designers at scalextric have been up to with the ARC Pro... very vey impressive!!! They have used the four key electronic power ‘switching’ assets within a digital system to realise both digital and analog capability at the throw of a switch... as I say... very very impressive design!!! But there has been one minor casualty... our ’beloved’ old curve lane changers... however taking on board the design approach of the ARC pro there are some easy solutions... my ARC pro arrives at the weekend and so I hope to share some solutions next week... meanwhile... I salute the scalextric guys... very very impressive design work on the ARC pro :-)

Dr_C

293 posts

Yes - 1 dead spot on both rails would work fine - but probably better to avoid the exact mid point for two reasons:

1/ this is precisely the location of the flexible copper tracks which interconnect the three pairs of rails on the underside.

2/ this is precisely the location of a set of rail retension tabs.

Therefore, moving the positioning of the deadspot away from the centre line by a least a couple of cm (along the direction of travel) would produce a more reliable result.

I still favour the modification to add just one additional dead spot on a single rail as per my above post... idea being to lift the rail, then cut, then replace... i’ll see if i can share some images to help clarify... 

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