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Bow Making for the Untalented
A (hopefully) weekly progression on the making of a split bamboo violin bow (although wood may be substituted for bamboo) using unskilled labor.should
Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 (8 votes) 
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Irv
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April 7, 2021 - 4:15 pm
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I have wanted to try a violin bow made from split bamboo.  And I wanted the bow shaft to be eight sided without the use of any scarf joints.  

Conventional technique for the making of split bamboo fly rods requires the use of six segments shaped using a wood plane resting on a special (expensive) adjustable steel form.  I happened upon a video of a rod maker using an unusual planing device.  I immediately reasoned that I could modify this technology to meet my needs.  See 2:40 of the linked video.

This thread will follow my process in making a violin bow with a split bamboo stick.  My only planned purchases will be the frog (Glasser plastic) and horse hair.  The basic concept can be adapted to accept wood as well.  Fractional bows, viola bows, and cello bows should be possible.  No clue about double bass bows.

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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ELCBK
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April 7, 2021 - 8:36 pm
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@Irv -

giphy.gif

This is very exciting! 

Very curious as to how you're going to deal with the "ideal" bow shape or if you discover a shape more befitting bamboo's properties. 

There's flyfishing interest in our family,

so I've previously seen how these rods are made. 

Can't wait! 

One Eyed Creature Smiley- Emily

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Irv
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April 8, 2021 - 8:23 am
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@ELCBK and others.  Regarding proper taper, we may need to do a deep dive.

The general scientific geometric model assumes an expression of taper from the Tourte  violin bows.  This was done by W.S.B. Woolhouse.  The variable h denotes the distance of any part of the bow from the head.

diameter, mm = 5.08 (log(h + 184) - 1.2150)

diameter, inch = 0.2 (log(h + 7.25) - 9.81)

It is also possible to create a taper directly from measurement of an existing implement.  My taper form has a 4 inch adjustment interval, so relatively few measurements need to be made in this regard. 

Another taper problem is that the mechanical properties of bamboo are different from wood.  I should be able to make the bamboo bow thinner (and lighter) than a wood counter part.  I see many carbon fibre bows that mimic the dimensions of wood bows.  I suspect that the mandrels were created without regard to the relative strength of the underlying materials and more toward aesthetic properties.

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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Irv
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April 8, 2021 - 1:49 pm
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My first thought about providing a logo was to use a laser engraver.  I do not have one of those and the length of the stick would likely necessitate cutting a hole in the side of the engraver.  Not ideal.  And an error in engraving would ruin the stick.

This method looks useful and cheap.  The effect should be lasting if protected with finish.

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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Irv
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April 9, 2021 - 10:28 am
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The gold standard glue for bamboo rod making was called resorcinol.  This must have been a brand name since I cannot find any.  I think this is the same material.  Please let me know if I am mistaken.2706C8DE-2E00-413B-9E1D-575B45957A8C.jpegImage Enlarger

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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Irv
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April 9, 2021 - 12:16 pm
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Work proceeds on the hand plane.F4412C89-FA88-44C2-984E-EFA177863C1D.jpegImage Enlarger

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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Irv
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April 9, 2021 - 3:47 pm
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Completed hand plane on segment of prototype planing form.  Now I have to make a 48” version of the planing form.551EAC09-8D2F-4D4A-A9DA-5396C56D5C5F.jpegImage Enlarger

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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ELCBK
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April 9, 2021 - 4:00 pm
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@Irv - 

Looks GREAT!

Resorcinol glue was used prior to epoxy resin. 

https://en.wikipedia.org/wiki/.....nol_glue 

Will you have to make more than one shape blade for your plane?

Will you be doing any shaping from within? 

What heat source will you use to straighten & shape the bamboo with?  I have a ribbon burner for my glass (oxygen/propane) - the C-shape burner in the video is very interesting. 

giphy.gif

 

...can't help but be curious!  😁

- Emily

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Irv
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April 9, 2021 - 11:40 pm
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@ELCBK .  Once the raw strips are created (I plan to use a wood band saw with a thin curf metal cutting blade), only one set of carbide inserts will be used to shape the strips.  I have three cutting edges on each insert and I am told that I can swap the inserts left to right to double potential use out of them.  I got the inserts for $1 each shipped from China, so durability is not an economic issue.

Another insert holder will be used to form the frog end bore needed for the frog advancing screw.  The same insert holder could be used to remove material from the interior if it is deemed desirable to lighten the stick.  I do not know if glue will just fill the channel.  Experimentation will be necessary to answer this.

I do not think it will be necessary for me to straighten the bamboo using the material I have selected.  I will remove moisture and roast the strips in a vacuum oven for a few minutes.

The C shaped burner in video is indeed very interesting.  It is likely from a European manufacture.  I have not been able to source one yet.  

I have a photo of a cross sectional view of a conventional six sided bamboo bow.  My goal is to have something similar, but with eight sides.

FFA68B2E-6DDE-40BD-A72D-B36E49E208F5.jpegImage Enlarger18CDE12A-E35E-4217-A71A-17672BCE9CD9.jpegImage Enlarger

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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Irv
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April 10, 2021 - 12:19 am
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Admittedly the link is just a single data point, but it is an encouraging data point.

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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ELCBK
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April 10, 2021 - 1:25 am
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@Irv -

VERY encouraging - 💖 it!

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Irv
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April 10, 2021 - 8:59 am
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Once glued, the bamboo strips must be bound with string to assure alignment.  Care must be made to have an equal amount of string wound in opposite directions so that the force resultants from string pressure cancel out.  Various contraptions have been created to do this task by split bamboo craftsmen which spins the bamboo assembly as the string is applied.  The common fault is that the spinning causes minute particles of glue to dislodge and adhere to the contraption.

This gentlemen has reduced the problem to first principles and made an elegant solution that does not suffer due to flinging glue.

Without deviation from the norm, progress is not possible.         —Frank Zappa

The future is already here—it’s just not very evenly distributed. —William Gibson

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ELCBK
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April 10, 2021 - 7:29 pm
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@Irv -

Great clamping technique!

Meant to ask about applying your logo. 

Have you considered a branding iron - for a faster and more permanent, but cost effective, solution? 

Electric branding irons might be an option and low-end desktop laser engravers are now reasonable, too.

But, custom brass logo stamp heads for branding irons/electric branding irons are only a few dollars - little more with handle on Etsy, etc... 

I'm sure you can find a way to clamp or screw one of those custom brass heads to a soldering iron - or to a burner from a cheap wood burning kit. 

For the method in your video, I have never found a water-based sealer worth using outdoors.

Thank you - this is great fun learning about all of this process.  

 

One Eyed Creature Smiley

Hope you can tell my questions are never meant to imply anything other than my own curiosity.

- Emily 

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