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Recent content by gbritnell

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  1. gbritnell

    Marks Holt 75

    Hi Mark, I'm glad everything is back on track. As usual the parts look great. I didn't get any responses to the rain cap I posted but I'm assuming you saw it. gbritnell
  2. gbritnell

    Marks Holt 75

    Hi John, Everyone has their own personal feelings about things. I have been on model engineering forums for many years and some posters welcome contributions to their threads while others don't. Mark feels very personal about his thread so to rectify the issue I would just take down your posting...
  3. gbritnell

    Marks Holt 75

    Hi Mark, Don't take it personal. I don't think there was any malice in his posting he was just enthusiastic about presenting his work. I understand your feelings after all the work and documentation you have done. I for one can't wait to see it completed and running. On another note, I replaced...
  4. gbritnell

    Marks Holt 75

    Tol JRR, Mark and any others that purchased the drawings for the Holt. I just made a drawing of the rain cap that I have on my exhaust. It adds a little bling when it's running slow. The drawing is attached. gbritnell
  5. gbritnell

    Marks Holt 75

    Wow! Lovely job on your engine! I can't wait to hear it running. I like what you did with the manifolds. Mark, The idea behind the square timing slot was that it would possibly produce a sharper cut-off to the Hall. It might work just fine with round holes but I have never tried it. I have made...
  6. gbritnell

    Marks Holt 75

    Hi Mark, The disc should be made from steel. Here's why. When I got involved with Hall trigger ignitions the first disc I made was of brass. When I spun the distributor I got no spark. In my mind I thought that with the brass being non magnetic it should work just fine to block the flux from the...
  7. gbritnell

    Marks Holt 75

    Hi Mark, I'm really anxious to see your engine completed! Your work has been outstanding! Of the drawing sets I've sold your's will be the first completed that I know of. As I sold the drawings I would get feedback about a missing dimension or feature that needed a little more explanation so...
  8. gbritnell

    270 Offy

    Hi Mike, Send me a PM for my email address. gbritnell
  9. gbritnell

    1/3 scale Galloway construction

    Hi Cogsy, I know the caps are a little unsettling but it was an accommodation to Criuser. gbritnell
  10. gbritnell

    1/3 scale Galloway construction

    HI CRUISER, I ANSWERED YOUR PM AND GAVE YOU MY EMAIL ADDRESS. I MENTIONED THAT I WOULD BE HAPPY TO ANSWER WHATEVER QUESTIONS YOU MIGHT HAVE. GBRITNELL
  11. gbritnell

    Motorcycle engine model

    What's the story behind it? Construction, materials used, dimensions etc.
  12. gbritnell

    Helical gear problems - Help

    Tsutrina, You are correct in what you stated. I guess what I tried to explain was 2 spur gears .50 wide have an instant contact of .50 whereas 2, 45 degree helical gears .50 wide will have an instant contact of much less. Yes as the 2 helical gears rotate each pair of teeth will mesh throughout...
  13. gbritnell

    Helical gear problems - Help

    I don't remember the dimensions of the shaft from the original drawings but I made mine .50 diameter. Helical gears don't need to be made too long because they're not like spur gears in the sense that the whole width of gear has tooth contact. Helicals only have contact for a short distance...
  14. gbritnell

    Helical gear problems - Help

    An app is not necessary. Download the spreadsheet from Don1966 and it will do everything you need to calculate the gear information. gbritnell
  15. gbritnell

    Helical gear problems - Help

    The reason the 9 tooth gear is larger than the 18 tooth gear is because as you increase the helix angle the gear gets larger. If you would take a cut through the 9 tooth gear at right angles to one tooth it would have the same profile as a spur gear of the same diametral pitch. So to evenly...
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