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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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How to make this ???
I want to have a go at making some custom handlebar risers for a
motorbike. I'll be using 53mm dia' round bar but I'm having trouble working out how to drill/bore the hole where the bars seat. It needs to be split into 2 sections, the bottom section is fastened to the bike and the top section clamps to this over the bars. The hole for the bars needs to be approx 22mm (7/8ths) and will have to be reamed out for accuracy. If I drill the hole out first then cut it on a bandsaw I'm going to lose the accuracy of the diameter with the width of the cut, I don't think that my bandsaw will create an accurate enough cut anyway. Is it possible to drill through the middle of two sections clamped together or will I have to drill two holes in the stock, cut, then mate two sections together? http://tinyurl.com/yrlo5d |
#2
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How to make this ???
Babba writes:
Is it possible to drill through the middle of two sections clamped together Yes, that would be the best way. |
#3
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How to make this ???
Babba wrote:
...snip Is it possible to drill through the middle of two sections clamped together http://tinyurl.com/yrlo5d Yes, that's how I do it. Its also a good idea to put a packing piece between the two sections so as to provide a reasonable clearance when finished. -- Regards, Gary Wooding (To reply by email, change feet to foot in my address) -- Posted via a free Usenet account from http://www.teranews.com |
#4
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How to make this ???
On Thu, 21 Feb 2008 05:22:32 +0000, Babba wrote:
I want to have a go at making some custom handlebar risers for a motorbike. I'll be using 53mm dia' round bar but I'm having trouble working out how to drill/bore the hole where the bars seat. It needs to be split into 2 sections, the bottom section is fastened to the bike and the top section clamps to this over the bars. The hole for the bars needs to be approx 22mm (7/8ths) and will have to be reamed out for accuracy. If I drill the hole out first then cut it on a bandsaw I'm going to lose the accuracy of the diameter with the width of the cut, I don't think that my bandsaw will create an accurate enough cut anyway. Is it possible to drill through the middle of two sections clamped together or will I have to drill two holes in the stock, cut, then mate two sections together? http://tinyurl.com/yrlo5d Yes. You can clamp 2 pieces together with a shim, the thickness of the gap you want, between the two pieces. You could run into trouble with a drill, however. Unless you have a very ridged set-up. Even so, I would drill it undersize, and bore it to size. Matt |
#5
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How to make this ???
We have made thousands of handlebar clamps for motorcycles. We CNC
mill the bar hole 7/8, 1" or 1-1/4" with a 3/4" end mill. Then we slice it in half with a 0.050" thick saw blade in a horizontal mill. If you don't have a horizontal mill, set up the saw blade in an arbor and slice it off that way. I think the saw blades are called Jeweler's blades. They have very fine teeth, are HSS and only cost a few bucks each at MSC. Dave |
#6
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How to make this ???
On Wed, 20 Feb 2008 23:22:32 -0600, Babba wrote:
I want to have a go at making some custom handlebar risers for a motorbike. I'll be using 53mm dia' round bar but I'm having trouble working out how to drill/bore the hole where the bars seat. It needs to be split into 2 sections, the bottom section is fastened to the bike and the top section clamps to this over the bars. The hole for the bars needs to be approx 22mm (7/8ths) and will have to be reamed out for accuracy. If I drill the hole out first then cut it on a bandsaw I'm going to lose the accuracy of the diameter with the width of the cut, I don't think that my bandsaw will create an accurate enough cut anyway. Is it possible to drill through the middle of two sections clamped together or will I have to drill two holes in the stock, cut, then mate two sections together? http://tinyurl.com/yrlo5d I used a boring head with an extended cutter holder I made. The half circle was cut full length from one side. A couple of pictures of a handlebar clamp I made. http://varian.net/wayne/hclamp/mvc-010f.jpg http://varian.net/wayne/hclamp/mvc-025f.jpg http://varian.net/wayne/hclamp/mvc-038f.jpg Wayne D. |
#7
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How to make this ???
On Feb 21, 8:53 am, "Dave, I can't do that"
wrote: We have made thousands of handlebar clamps for motorcycles. We CNC mill the bar hole 7/8, 1" or 1-1/4" with a 3/4" end mill. Then we slice it in half with a 0.050" thick saw blade in a horizontal mill. If you don't have a horizontal mill, set up the saw blade in an arbor and slice it off that way. I think the saw blades are called Jeweler's blades. They have very fine teeth, are HSS and only cost a few bucks each at MSC. Dave And they are not hack saw blades! They snap real easy. Paul |
#8
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How to make this ???
Er, Paul,
And they are not hack saw blades! They snap real easy. They are round milling cutter blades, hence the "arbor" comment. We have never "snapped" a single one. Dave |
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