Ever modified a crank to add a granny?
08-26-19, 04:59 PM
#51
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lol....thanks, again, terry
i'd thought of doing a set up along those lines, as well. however, my project just got as simple as it can get, i think.....
my wife found this drill press for me at a yard sale yeeeaarrsss ago. at the time, i just plugged it in, kinda dinkered with it a bit, and thought "cool...at some point i'll get to use it". well, my shop didn't (still doesn't) have power, yet, so i set it out of my way and there it has remained. since running electricity (very big task) has taken a back seat to a lot of other stuff, i've just gone to my friend's shop about a mile away for things i've need to do. his was bigger, anyway. (shut up!) i don't have that luxury anymore, though. he closed his doors last year. anyway, about an hour ago i went out to gather parts and stuff in an effort to get moving on this thing and then i discovered ...very cool....the table on my press swivels radially as well vertically and horizontally. i hadn't realized it would do that! so, you know what that means? yessss! i can just run a bolt through the taper and through hole in the middle of the table and easily line the bit right up to the marks i make on the spider without any sort jig or template or fixture otherwise. man!
now to try and find hardware
i'd thought of doing a set up along those lines, as well. however, my project just got as simple as it can get, i think.....
my wife found this drill press for me at a yard sale yeeeaarrsss ago. at the time, i just plugged it in, kinda dinkered with it a bit, and thought "cool...at some point i'll get to use it". well, my shop didn't (still doesn't) have power, yet, so i set it out of my way and there it has remained. since running electricity (very big task) has taken a back seat to a lot of other stuff, i've just gone to my friend's shop about a mile away for things i've need to do. his was bigger, anyway. (shut up!) i don't have that luxury anymore, though. he closed his doors last year. anyway, about an hour ago i went out to gather parts and stuff in an effort to get moving on this thing and then i discovered ...very cool....the table on my press swivels radially as well vertically and horizontally. i hadn't realized it would do that! so, you know what that means? yessss! i can just run a bolt through the taper and through hole in the middle of the table and easily line the bit right up to the marks i make on the spider without any sort jig or template or fixture otherwise. man!
now to try and find hardware
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08-26-19, 05:01 PM
#52
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i'd need an italian bike first! don't give me an excuse....lol!
08-26-19, 05:22 PM
#53
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The derailleur will take up any out-of-round you introduce, and it's a granny gear, it's not like you're going to spend a ton of time in it. I would just go for it. I would rest the chainring bolt flats of the crank on some blocks to make sure it's parallel with the face of the crank. Depending on your drill press table, you may be able to stick an appropriate sized bolt up through the table and put that through the square tapered hole so that you can put all the holes the same distance from the center. Using the chainring as a template is also a good idea. I'd bolt it down to the first hole you drill/tap and then each consecutive hole. Do them in a cross pattern, probably. If the surface you're entering is at an angle, it may benefit you to buy a 1/4" or 5/16" flat endmill to throw in your drill press chuck and touch to the face you're drilling to make it flat so that the drill doesn't try to move as it's entering an angled face. Plunging an endmill should not be a problem for your drill press chuck, despite what others may tell you.
Oh, and you know about the trick to use a tap guide in the chuck of your drill press to align the tap and provide a little pressure, right? It requires your work to be held down to your drill press table, but it makes tapping a lot easier. Just don't move anything after you have drilled the hole, chuck the tap guide in your drill press, and pilot the tap with it.
i know nothing about the tap guide you speak of. i was just going to tap with a hand tool. but, easier works for me. i'll look into it
08-26-19, 11:29 PM
#54
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@scarlson
re: tap guide......i actually had one of those a long time ago! geez....wonder if i still have it. never knew what it was. i pick up little lots of tools from yard sales and flea markets sometimes and don't always know what i'm getting. price is right, though!
re: tap guide......i actually had one of those a long time ago! geez....wonder if i still have it. never knew what it was. i pick up little lots of tools from yard sales and flea markets sometimes and don't always know what i'm getting. price is right, though!
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08-27-19, 01:18 AM
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lol....thanks, again, terry
i'd thought of doing a set up along those lines, as well. however, my project just got as simple as it can get, i think.....
my wife found this drill press for me at a yard sale yeeeaarrsss ago. at the time, i just plugged it in, kinda dinkered with it a bit, and thought "cool...at some point i'll get to use it". well, my shop didn't (still doesn't) have power, yet, so i set it out of my way and there it has remained. since running electricity (very big task) has taken a back seat to a lot of other stuff, i've just gone to my friend's shop about a mile away for things i've need to do. his was bigger, anyway. (shut up!) i don't have that luxury anymore, though. he closed his doors last year. anyway, about an hour ago i went out to gather parts and stuff in an effort to get moving on this thing and then i discovered ...very cool....the table on my press swivels radially as well vertically and horizontally. i hadn't realized it would do that! so, you know what that means? yessss! i can just run a bolt through the taper and through hole in the middle of the table and easily line the bit right up to the marks i make on the spider without any sort jig or template or fixture otherwise. man!
now to try and find hardware
i'd thought of doing a set up along those lines, as well. however, my project just got as simple as it can get, i think.....
my wife found this drill press for me at a yard sale yeeeaarrsss ago. at the time, i just plugged it in, kinda dinkered with it a bit, and thought "cool...at some point i'll get to use it". well, my shop didn't (still doesn't) have power, yet, so i set it out of my way and there it has remained. since running electricity (very big task) has taken a back seat to a lot of other stuff, i've just gone to my friend's shop about a mile away for things i've need to do. his was bigger, anyway. (shut up!) i don't have that luxury anymore, though. he closed his doors last year. anyway, about an hour ago i went out to gather parts and stuff in an effort to get moving on this thing and then i discovered ...very cool....the table on my press swivels radially as well vertically and horizontally. i hadn't realized it would do that! so, you know what that means? yessss! i can just run a bolt through the taper and through hole in the middle of the table and easily line the bit right up to the marks i make on the spider without any sort jig or template or fixture otherwise. man!
now to try and find hardware
08-27-19, 12:43 PM
#56
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@merziac ....thanks! i've perused their website before. we have a local source just like them, but usually you have to buy in bulk quantities. they're really set up to supply the pro's
what i'd like to try and find, which may be non-existent, are some studs with one end being the size of regular chainring bolts and the other being smaller...that end going into the spider. i know i've seen studs similar to that, but i wouldn't even know how to search for them. iow's, if there's a specific term for that style. as with many things, i'll simply begin by using my best guess...
edit: okay, they're called step studs. i just have to find out what thread pitch and size chainring bolts are. find studs that have the large end of that size, the other end will be smaller with whatever pitch/size and i can trim length if i have to.
here's an example....
that's a course thread and they're $3 a pop. likely i can do better in quantity/price by shopping around, though
what i'd like to try and find, which may be non-existent, are some studs with one end being the size of regular chainring bolts and the other being smaller...that end going into the spider. i know i've seen studs similar to that, but i wouldn't even know how to search for them. iow's, if there's a specific term for that style. as with many things, i'll simply begin by using my best guess...
edit: okay, they're called step studs. i just have to find out what thread pitch and size chainring bolts are. find studs that have the large end of that size, the other end will be smaller with whatever pitch/size and i can trim length if i have to.
here's an example....
that's a course thread and they're $3 a pop. likely i can do better in quantity/price by shopping around, though
Last edited by thook; 08-27-19 at 12:58 PM.
08-27-19, 06:43 PM
#59
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thanks, fellas. yes..i will wait to have hardware before getting the tap and drilling! good of you to point out
08-27-19, 07:27 PM
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Here's something I built in '83 for an MTB-converted road bike (Austro-Daimler Inter 10 with a dinged seat tube that I got for free). Fuji-branded Sugino Maxy double with a SunTour Perfect 22T freewheel cog as the inner. Some bolts and nuts and washers and here you go. I call it my K-Mart Triple and it currently resides on my Cimarron that's built up with all the parts from that earlier A-D.
That 22T cog was the smallest with a multiple of five holes/slots that would work with the 5-arm crank.
Here's the original upon completion of the build half a lifetime ago.
I also have that now-somewhat-weathered Two Wheel Travel sign hanging on the back of my garage.
That 22T cog was the smallest with a multiple of five holes/slots that would work with the 5-arm crank.
Here's the original upon completion of the build half a lifetime ago.
I also have that now-somewhat-weathered Two Wheel Travel sign hanging on the back of my garage.
Last edited by thumpism; 08-28-19 at 08:22 AM.
08-27-19, 11:35 PM
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that's great! fancy it up with some chrome acorn nuts and you'll have the k-mart "especial" 
08-28-19, 01:11 AM
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08-28-19, 03:12 AM
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This is what im talkin about!!!!
08-28-19, 08:22 AM
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If you try, the appropriate screws and spacers for the third chainring, are these:
https://www.xxcycle.fr/visserie-pour...-mygal,,fr.php
https://www.xxcycle.fr/visserie-pour...-mygal,,fr.php
-J
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08-29-19, 12:14 PM
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so, after looking, it started to become less than simple and easy enough to find studs that fit the parameters of size, spacing, and any hopeful cost savings. there is none on the latter. no harm trying 
so, i'm just going to get some of the hardware depaso suggested. i mean, how often will i have to change out the ring, right? hopefully, i can get to this project in the next couple of weeks....after i've repaired a fuel line on the 4rnr (gotta drop the tank) and completed some honey-do stuff.
@Depaso thanks for the link!
so, i'm just going to get some of the hardware depaso suggested. i mean, how often will i have to change out the ring, right? hopefully, i can get to this project in the next couple of weeks....after i've repaired a fuel line on the 4rnr (gotta drop the tank) and completed some honey-do stuff. @Depaso thanks for the link!
08-29-19, 03:43 PM
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Over the past several months I've converted all 8 of my Campagnolo Record equipped bikes to triples using bolt kits and 74mm bcd rings from xxcycle. I used a 144/74 triplizer chainring as a template, with brass insert collars for guiding the drill bit and tap (I have a drill press and a lathe). I find this method to be quick and sufficiently precise, so I think your template method will work fine. It's a bit of a challenge to research and procure the bottom bracket parts that will produce the right chainline for each bike, but I managed, using various combinations of spindles, thin cups, thick cups, spacers, shims, etc. The conversions all worked out great, and it sure makes it more pleasant to ride these bikes in the fairly hilly terrain around here.
08-29-19, 07:58 PM
#67
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Over the past several months I've converted all 8 of my Campagnolo Record equipped bikes to triples using bolt kits and 74mm bcd rings from xxcycle. I used a 144/74 triplizer chainring as a template, with brass insert collars for guiding the drill bit and tap (I have a drill press and a lathe). I find this method to be quick and sufficiently precise, so I think your template method will work fine. It's a bit of a challenge to research and procure the bottom bracket parts that will produce the right chainline for each bike, but I managed, using various combinations of spindles, thin cups, thick cups, spacers, shims, etc. The conversions all worked out great, and it sure makes it more pleasant to ride these bikes in the fairly hilly terrain around here.
08-30-19, 10:35 AM
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Over the past several months I've converted all 8 of my Campagnolo Record equipped bikes to triples using bolt kits and 74mm bcd rings from xxcycle. I used a 144/74 triplizer chainring as a template, with brass insert collars for guiding the drill bit and tap (I have a drill press and a lathe). I find this method to be quick and sufficiently precise, so I think your template method will work fine. It's a bit of a challenge to research and procure the bottom bracket parts that will produce the right chainline for each bike, but I managed, using various combinations of spindles, thin cups, thick cups, spacers, shims, etc. The conversions all worked out great, and it sure makes it more pleasant to ride these bikes in the fairly hilly terrain around here.
08-30-19, 11:09 AM
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Here's something I built in '83 for an MTB-converted road bike (Austro-Daimler Inter 10 with a dinged seat tube that I got for free). Fuji-branded Sugino Maxy double with a SunTour Perfect 22T freewheel cog as the inner. Some bolts and nuts and washers and here you go. I call it my K-Mart Triple and it currently resides on my Cimarron that's built up with all the parts from that earlier A-D.
That 22T cog was the smallest with a multiple of five holes/slots that would work with the 5-arm crank.
(...)
That 22T cog was the smallest with a multiple of five holes/slots that would work with the 5-arm crank.
(...)
09-03-19, 04:28 PM
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09-04-19, 02:46 AM
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09-04-19, 06:45 AM
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Thanks a lot. I have contacted them, and they said "We are expecting an answer from our supplier and we will let you know as soon as possible." Can you post a pic of the bolts you received, and/or the packaging?
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09-04-19, 10:11 AM
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Triple bolts
You ordered the correct part number 3762 (Stronglight 350008), but it seems the package contains washers instead of the bolts. I'm guessing this was a Stronglight packaging error that xxcycle didn't notice. I've bought several sets of 3762 from xxcycle, plus several sets of 3803 (Stronglight 350026, which are the complete Mygal triple crank bolt set including double chainring bolts and triple bolts), plus several 74bcd chainrings. Everything has arrived correctly, so it just seems you had some bad luck. I've found the service from xxcycle to be very good, so hopefully they will make this right. They do have a couple of problems with their product photos.