Birkonium CNC Services

Guitar and Bandura Parts - Custom CNC

Guitar and Bandura Parts - Custom CNC

Acoustic Neck Spec Sheet

Scroll Down past the drawing for more information. We recommend downloading the print and description and printing them out for reference when specifying a neck. You will be sent a copy of the specification form to the e-mail given.

Birkonium Neck General Drawing

Downloadable drawing for reference click here

Downloadable spec sheet for reference click here

Neck Spec Sheet

All parameters with a letter in front of the description are called out on the Birkonium Neck General Drawing. Please note that for values less than 1, you must enter a leading zero (e.g. 0.5, not .5) to be able to submit the form. All values are in decimal inches.
  • Give your neck a name! e.g. Bob's 000 13 fret. This is how we'll refer to this specific neck for future orders
  • Please enter a value between 18 and 36.
    e.g. 25.34 – this is the actual scale length of your instrument. This parameter is used to calculate the overall length of neck
  • Please enter a value between 11 and 18.
    The fret where the neck joins the body. Used with other parameters to calculate the length of the neck
  • Please enter a value between 0 and 0.1.
    Shortens the neck by this amount to account for nut compensation in the fretboard
  • Please enter a value between 0 and 0.4.
    Lengthens the fretboard by this amount. Used to allow the nut to sit on the fretboard plane. Use zero if you wish to have your nut on the angled portion of the headstock.
  • The Volute is the transition between the neck barrel and the head stock. See photos HERE for examples. The exact volute shape is dependent on several other parameters, particularly the Diamond volute
  • A Smooth 'swooping' blend as shown in the drawing is normally programmed to transition from the barrel of the neck to the headstock. If you wish for there to be an abrupt transition which leaves more material for hand shaping, select 'No'
  • Please enter a value between .25 and .75.
    e.g. 0.525 Must be thinner or equal to neck thickness at the Nut. This parameter interacts tremendously with the Diamond volute type. For a good looking diamond, please make sure the headstock is at least .1 or more thinner than the neck at the nut
  • e.g. 1.75. This is also the width of your fretboard at the nut. Birkonium will add 0.040” to this width to allow for more flexibility in blending to the fretboard. Due to the nature of holding the part for machining, width sometimes comes out narrower than specified but never wider.
  • This is the fret at which the taper of the neck is specified. Can be a different fret than the join fret. Eg, you may specify the taper at the 12th fret for a 14 fret neck
  • e.g. 2.125. Birkonium will add 0.040” to this width to allow for more flexibility in blending to the fretboard. Due to the nature of holding the part for machining, width sometimes comes out narrower than specified but never wider.
  • Please enter a value between .450 and 0.85.
    e.g. 0.6” Thickness of the neck profile at the 1st fret. This is also a parameter that some luthiers add a both of thickness to for further customization in the shop
  • Please enter a value between .50 and 1.00.
    e.g. .7” Thickness of the neck at the 9th fret – must be larger than the thickness at the nut.
  • "C" Type is the standard neck profile, "V" type is similar to the M-style V neck
  • Please enter a value between 2 and 3.9.
    the height of the heel measured from fretboard gluing surface to endcap
  • Please enter a value between 0 and 3.
    In degrees.
  • aka M-Style and G-style. See illustration HERE for examples.
  • This is the length of the small end of the heel
  • This is the width of the heel at the small end. Without further customization and an additional charge for tooling, this width must be smaller than the width at the join fret to allow the heel to taper along its height.
  • Please enter a value between 0.250 and 0.6.
    This is the width of the truss rod slot. Leave as is if using a Martin trussrod.
  • Depth of the truss rod slot - Leave as is if using a Martin Trussrod
  • Length of the truss rod from the end of the Tenon. All truss rods go through the heel. Making this parameter longer than the length of the barrel of the neck will result in a headstock adjust neck. Confirm in the next step
  • Defines whether the truss rod adjustment slot exits at the heel or the headstock. Heel or headstock Adjust or Martin style. Martin style has a round bottom and sized to fit a standard Martin Truss rod. Martin style trussrods are available from Birkonium
  • If you wish to cut the tenon yourself, use the Luthier cut tenon option. We can cut partially (about 1/4") into the tenon area for a reference as to where the true end of the neck is not including the tenon.
  • Please enter a value between 0 and 1.
    Length of the tenon. Enter zero for a butt joint.
  • Will you require a heel block or will you use your own.
  • Birkonium Stocks Martin™ OEM truss rods in both 14 fret lengths and 12 fret lengths for $14 each. Please let us know if you'd like any
  • Please enter a value between 1 and 100.
    Enter how many necks you'll be ordering with this order
  • Please enter a value between 1 and 100.
    If you build a lot, what's your anticipated neck order with Birkonium (quantity discounts may apply)
  • Please add any other information about your neck here
  • Let us know how you heard about Birkonium Custom CNC Necks!