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Dr_C

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Dr_C

286 posts

In above post... should read ‘digital to analog’ snips.... apols... :-)

Dr_C

286 posts

I’m a bit puzzled by Gorp’s analysis that suggests that other track parts require changing/modification if using the stock ARC PRO in analog mode. Clearly the curved lane changers will require the standard ‘analog to digital’ snips to the flexible pcb tracks - but I would assume this a given and mentioned in one of my earlier posts. Meanwhile, the reason why the slot forum mod is incompatible with analog mode is that it (not surprisingly) results in the two cars driving in opposite directions when in analog mode i.e. unsuitable for analog racing. Would a table showing the pros and cons of options A,B and C add useful value to this topic/subject?

Dr_C

286 posts

Thanks Gorp for this - yes - I now see my second sentence was a bit ambiguous I should have more precisely stated that ’With the standard stock ARC PRO the signal polarities of lane 1 and lane 2 are reversed with respect to each other.’ Does that help with consistency and interpretation of my post?

Also I agree that my so called ‘Option C‘ is more complex to implement than slot forum simple soldering mod, however Option C enables rapid switching from full digital capability to full analog capability simply by swapping out the two modified track parts with two standard parts. To achieve the same effect with the slot forum mod would, as proposed within the post, require an additional switch and... perhaps some cutting of the brand new ARC PRO enclosure to make the additional switch accessible. Taking this into account the effort is probably reasonably similar for those users who need both full digital and full analog capabilities.

Thanks again Gorp for spotting the ambiguity in my second sentence - much appreciated!

Dr_C

286 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

286 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

286 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

286 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

286 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

286 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

286 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...

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