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Honza

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Everything posted by Honza

  1. Honza
    I'm not sure what's target of 90% of Tamiya's products. This one doesn't look like competition buggy. But ball diffs with cageless thrust bearings and overall complexity doesn't look like beginner's backyard buggy either.
  2. Honza
    Yes, even Tamiya's TRF503 had gear diffs. Quite interesting they went back to ball diffs in TD4.
  3. Honza
    Yes, it looks like the whole transmission is based around XV01 gears, with extra bevels that replace belt with shaft drive.
  4. Honza
    Never heard this one but it sounds like total nonsense. Do you call 3mm balls "metric 3/32" too? Because that'd be the same thing. It's just wrong and it doesn't matter who calls it like that.
  5. Honza
    But that's differential pitch, not spur gear pitch.
  6. Honza
    What is "metric 48"? Tamiya uses metric 0.4, 0.5, 0.6 but TRF buggies (and slippers taken from them) have proper 48p. XV has slipper derived from TRF201. 48p is 0.53 - close to 0.5, but not close enough to be compatible (it needs to be within 0.01mm) m0.6 is 42p (I think I've seen some Traxxas gears in this pitch)
  7. Honza
    There's one method, which address this issue - remelting/annealing prints in salt or plaster makes even FDM prints airtight: It might be good enough atleast for prototypes
  8. Honza
    Any update on chassis conversion?
  9. Honza
    Centre to centre of drive pins. It might be +-1mm, I'd have to measure them again. It's centre to centre length, 55mm might be overall length.
  10. Honza
    What I can remember from onroad chassis: 39mm - TL01, TA01 / 02T, DF-03RA, XV01 rear 42mm - TA02 front, TB02, TA05 + some other cars with TRF414 suspension, XV01 front, TB03D 45mm - TB03, TA05V2 48mm - F201, TA05IFS
  11. Honza
    Maybe diff joints for TT01 (53790 or 9804237) would make it easier?
  12. Honza
    I have one question regarding to G6-01. What's size of #54808 idler? I assume that it's neatly identical to TL01/M0x differential gear? I need it for project I am working on. Thanks.
  13. Honza
    I think it was discussed earlier in another thread, but it'd be nice, if tamiya made standard sized onroad/rally tires for 1.7 or 1.55 rims. Some bodies would benefit from it. Also, some decent entry-level rally chassis. I found that MF01 would be pretty capable, if it had mid motor and proper (long arm) suspension.
  14. Honza
    That was my first thought. Front motor layout looks great, if suspension has enough travel (or can be replaced by standard TC or XV01 suspension), it could be decent rally car. Thing that I dont like about this chassis are integrated differential gearcases... Stripped thread means whole chassis disassembly (interesting how Tamiya used drop-in nuts in most parts, with exception of gearboxes) instead of swaping gearcase. Also custom chassis (for long wheelbase F1 for example) is impossible
  15. Honza
    This is not only problem of vintage.. modern rally cars use 15" rims with high sidewall for gravel races, so RC rally car with low profile offroad tires looks weird, too.
  16. Honza
    That's because small hole for screw has 2mm in diameter, but input shaft is 3mm. Crosspin is same 2x8mm. You're right, it's extra work to make it fit, it's needed only if you want low FDR.
  17. Honza
    You can fit Evo 4 gear on TB03 shaft, if you drill hole to correct diameter and file that excess material. I did it by placing gear on 5mm shaft, so it could spin freely, and then used dremel to take material away evenly.
  18. Honza
    I know, that you have no issues, but alternative with 39T crown and 16T input bevel is 51255 from TB-evo 5, which was used in TB03 one-way set. Also, I'm not sure if it was mentioned before, but 51438 is compatible with TB03, from my experience, 12-ball diff can be built looser and smoother than 8-ball.
  19. Honza
    @ThunderDragonCy Mesh might be little off, because bevel gear angle changes with gear ratio. But it's just 1 tooth, so difference will be very small, about 1 degree, which might have no effect at all.
  20. Honza
    Evo 4 crown gear is 39T, but input gear is one tooth larger - now I can't remember exact number - so it won't work with TB03 diff on other end. You'll need TB03 spool/one way gearset. Also from what I've read, end of input shaft have to be grinded a bit, otherwise it rubs against diff case. You could also build ball diff with TB04 gears, it has 12 balls, so it'll be slightly smoother.
  21. Honza
    New TC-01 would be interesting, it has similar layout to competitive buggies. But I'm affraid that suspension mounts are too weak for long arms..
  22. Honza
    Right now, I'm testing 3D printed gear in my MF01X, printed from PET-G on FDM printer with 0.2 nozzle. I had time to run only 1 pack, but it survived so far. It seems that 0.8 gears can be printed with reasonable detail on FDM, they mesh properly with original gears. I plan to test 0.6 and also printed-to-printed in future.
  23. Honza
    48P is 0.53 metric. So it's not "small difference", even 0.5 metric doesn't fit right - according to man who makes precise gears for RC cars, difference under 0.01mm is accetable. But 64p is 0.397, which is much closer - I guess that injection molded gears have larger variation in dimensions than that.
  24. Honza
    0.4 is compatible with 64p pinions, if that helps
  25. Honza
    I think that MF-01 was good idea, but it lacks in realisation. It solved some issues of TL01 and added modularity to make it truly versatile. But high-mounted rear motor and weird rear geometry offset those improvements for me..
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