clivegto Posted December 14, 2022 Share Posted December 14, 2022 What sort of thickness would you nice peoples recommend for a subframe like on this Martek. Am thinking 4mm but is that to thin? 2 Quote Link to comment
TonyGee Posted December 14, 2022 Share Posted December 14, 2022 I tend to over engineer stuff so I would go thicker !!!! I don't worry about the weight of things 1 Quote Link to comment
clivegto Posted December 14, 2022 Author Share Posted December 14, 2022 7 minutes ago, TonyGee said: I tend to over engineer stuff so I would go thicker !!!! I don't worry about the weight of things I want to keep the weight down as much as possible for this but still be very strong. Quote Link to comment
clivegto Posted December 14, 2022 Author Share Posted December 14, 2022 Coz we like pictures 1 Quote Link to comment
davecara Posted December 14, 2022 Share Posted December 14, 2022 That looks like 6 or maybe 8mm Quote Link to comment
clivegto Posted December 14, 2022 Author Share Posted December 14, 2022 1 hour ago, davecara said: That looks like 6 or maybe 8mm Yea it does which makes me think it would be quite heavy. Quote Link to comment
dupersunc Posted December 14, 2022 Share Posted December 14, 2022 I'm guessing 6mm. Drill lots of big hole in it to get the weight down. 4mm won't be stiff enough imho. 2 Quote Link to comment
Wagola Posted December 14, 2022 Share Posted December 14, 2022 4 hours ago, dupersunc said: I'm guessing 6mm. Drill lots of big hole in it to get the weight down. 4mm won't be stiff enough imho. It does look thicker than 4mm which sounds a bit thin IMHO, so I'd think 6mm. But if you cut hole and 'swage' them you will add stiffness. 1 Quote Link to comment
TLRS Posted December 14, 2022 Share Posted December 14, 2022 (edited) Look at the thickness of rearsets, caliper brackets, shock mounting hardware. Check shock travel and multiply it by the springrate. Some of these brackets look very skinny but take huge loads. Look at the length of stock subframes and imagine the loads two up with some luggage. Hanging exhausts of the side. If you have a very light tail section and your ass is only inches away from that already substantial bit where the tank mounts to, you could probably get away with a very svelte subframe. Would beef stuff up around the bolt holes though, that's what you see on stock subframes too. Edited December 14, 2022 by TLRS 1 Quote Link to comment
Fazz711 Posted December 15, 2022 Share Posted December 15, 2022 At a guess I would say it 8mm Quote Link to comment
Ivan Posted December 15, 2022 Share Posted December 15, 2022 Isnt the construction more important than thickness? 3 Quote Link to comment
Joseph Posted December 15, 2022 Share Posted December 15, 2022 (edited) There are two substantial tubes welded in between the plates There are 4 holes drilled to hold what seems to be a battery box Those two features will totally lock the structure solid. Judging by the last couple of photos, the plates are definitely thinner than the holes drilled to hold the battery box An 8mm hole would realistically mean 4-5 mm of plate thickness ? Edited December 15, 2022 by Joseph 2 Quote Link to comment
TonyGee Posted December 15, 2022 Share Posted December 15, 2022 1 hour ago, Ivan said: Isnt the construction more important than thickness? it does make a difference if its done right. 1 Quote Link to comment
clivegto Posted December 16, 2022 Author Share Posted December 16, 2022 10 hours ago, Joseph said: Judging by the last couple of photos, the plates are definitely thinner than the holes drilled to hold the battery box An 8mm hole would realistically mean 4-5 mm of plate thickness ? I was thinking along these lines. 1 Quote Link to comment
Joseph Posted December 16, 2022 Share Posted December 16, 2022 7 minutes ago, clivegto said: I was thinking along these lines. Yep i always check surroundings to see what i can estimate thanks to "known" details when it comes to this sort of thing. 4mm alu plate is quite solid, especially if you're doing a "replica" of the structure here and similar bracing points 1 Quote Link to comment
denisd Posted December 16, 2022 Share Posted December 16, 2022 I think it's 4mm plate, the strength is needed vertically so the thickness of the plate is less important than the fabrication and design of the subframe. 2 Quote Link to comment
Dezza Posted December 16, 2022 Share Posted December 16, 2022 17 minutes ago, denisd said: I think it's 4mm plate, the strength is needed vertically so the thickness of the plate is less important than the fabrication and design of the subframe. That's what i was thinking: align a plastic ruler vertically, then try and bend it. Then lay it flat and try and bend it. There is obviously a big difference here. 1 Quote Link to comment
clivegto Posted May 21, 2023 Author Share Posted May 21, 2023 @Ben Slabbygave me this, cheers mate. We don't know who made it but it's made of 5mm plate, so that answers my own question 7 Quote Link to comment
Grove Posted August 30, 2023 Share Posted August 30, 2023 Where’s the best place to get rear subframes made, I’d like mine about 2 inches higher at the rear to lift the rear of the seat a bit Quote Link to comment
BoostedRooster712 Posted August 31, 2023 Share Posted August 31, 2023 I know the last owner of my bike went to steelheart (sp?) engineering when he picked the bike up after 12 months of it not being finished. Was meant to be 2 weeks. Quote Link to comment
clivegto Posted August 31, 2023 Author Share Posted August 31, 2023 8 hours ago, Grove said: Where’s the best place to get rear subframes made, I’d like mine about 2 inches higher at the rear to lift the rear of the seat a bit Make the subframe up yourself then take it to a welder to stick it together, it's what I do, I get Will to do my aluminium welding at Weab Motors Malton. Quote Link to comment
BoostedRooster712 Posted August 31, 2023 Share Posted August 31, 2023 I don't know if this helps but this is how mine is set up and the seat fits well. Fucking phone. Sorry about the rotation. I'm not sure if Walker made this or the other guy did. 1 Quote Link to comment
geogsxr Posted January 26 Share Posted January 26 On 12/14/2022 at 12:28 PM, clivegto said: Coz we like pictures Shame this guy has such a bad reputation. These are stunning. 1 Quote Link to comment
bunk Posted January 26 Share Posted January 26 Im a little late to the party, but i say go 4mm and dimple die the holes. Would be plenty strong then. Quote Link to comment
clivegto Posted January 26 Author Share Posted January 26 5 hours ago, geogsxr said: Shame this guy has such a bad reputation. These are stunning. Still in business as well. Always loved the Martek big tube frames back in the day. Quote Link to comment
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