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Recreational Figure Skating FAQ - Blades


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Archive-name: sports/skating/ice/rec-skate/blades
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Last-modified: Feb 27 2007
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                        Recreational Figure Skating FAQ

     * Home
     * Index
     * Questions
     * Basic Skating
     * Advanced Skills
     * Adult Skaters
     * Boots
     * Blades
     * Injuries
     * Off-ice
     * Tests

5. Blades

   Blades are commonly made in 1/4 inch lengths. Blades also have different
   widths  and  radii, as well as different configurations of the "bulge"
   (spinning area) and toe picks. These all have major effects on the way a
   blade "feels". A list of commonly available blades and their characteristics
   and prices is given in Appendix 1.

   Figure skate blades start out in three separate parts. TOE plate. HEEL plate
   and the part that actually does the work on the ice. These are punched out
   on large presses. The blades are blanked out of long strips of steel which
   vary in Carbon content depending on the quality of the particular skate
   blade that is being made.(i.e. a Majestic would have a lower grade of steel
   than say a Phantom or Pattern 99 Although the steel used for all blades
   hardens  to  the  same  standard, the better grade would keep its edge
   longer(under equal conditions).

   Before the three parts are put together to make the skate the blade section
   is hardened. This is done in large quantities hung on a frame and lowered
   into a high temperature salt bath for a set period of time to be evenly
   heated and while still glowing red are quenched in an oil bath. The shock of
   the sudden decrease in temperature causes the steel to harden . However, the
   hardness at this stage is too brittle, so the blades (still on the frame)
   are put into another salt bath of a lower temperature to temper to about
   what  is called 60 degrees on the Rockwell scale. When cooled they are
   removed  from  the frames fed into a machine that grinds them to a set
   thickness.

   The toe and heel plates (already ground) are then brazed to the blade. There
   are two methods of joining the parts together. John Wilson products are all
   silver  soldered.  This  is a fairly low temperature braze achieved by
   electrical coil induction which causes the heat from the brazing to travel
   down onto the blade reducing the hardness to about 40 degrees Rockwell 'C'
   for about halfway but leaving the lower "working" half (about 5/16'') still
   at 60 degrees. Mitchell & King on the other hand silver solder theirs but
   the top quality blades such as Phantom, Gold Star etc. are hand brazed with
   bronze. This operation creates a lot more heat therefore the blades, by no
   means soft could be a bit patchy in their hardness. They are then set into
   an  induction coil, electrically heated, rehardened and tempered about
   halfway up the blade.

   You can tell if your blades are hand brazed. If you look at them you will
   notice that where the toe and heel plate joins the blade there is a very
   large radius. This method is very strong. Silver soldered skates will have a
   small bead of braze so the radius will be much smaller. However silver
   solder flows well and fills gaps readily. So, whichever method is used there
   will still be 5/16'' or more of correct hardness.

   The assembled blade is now chrome plated, the profile is ground on and the
   chrome is removed from the edges by grinding. This is the line that you see
   each side of the blade edge. This is removed so that hardened steel and not
   chrome is at the working surface. There is of course extensive polishing and
   inspection before shipping.

  5.1 Buying new blades

   The blade length denotes the measurement from the front of the sole plate to
   the back of the heel plate. Measure the length of the sole from toe to heel
   and fit blades which are 1/4 inch less in length.

   Some people believe that they have to buy blades that are super expensive in
   order  for them to become great skaters. You should buy well-built and
   *appropriate* equipment. Skaters gradually upgrade their equipment as their
   needs change, for example a skater may need to upgrade skates when they move
   from basic skating to their first jumps or from double to triple jumps.
   Advanced blades require the skater to perfect his/her technique.

   Top of the line blades are designed for very advanced skaters. Advanced
   free-style blades have a longer radius and have *large* toe picks. Also, the
   portion of the blade that is used for spinning is much shorter than on
   intermediate blades; that means that unless you are perfectly balanced and
   positioned going into and during the spin you will start rocking on the
   blade. Intermediate blades like the MK Professional, Coronation Ace, etc.
   provide you more "room" to make corrections and continue spinning even if
   you are slightly off balance.

   Just because the MK Gold Stars are typically over $400 does not mean that
   they are inherently better blades than MK Pros or Phantoms. Starting with MK
   Pro and Coronation Ace lines, the blades are all made using much the same
   materials  and  manufacturing  process  as  described above. To put it
   succinctly, certain blades are more expensive simply because of supply and
   demand and a few slight design modifications like side honing which makes
   them marginally more costly to produce.

  5.2 Three ways of checking used blades:

   1. Look at how thick the dull strip is on the sides of the blades along the
   edges. They were three or four millimeters when new. If they're now thin,
   then your blade has been sharpened many times. The concern here is that the
   rocker may be distorted after many sharpenings, and it is almost impossible
   to restore without specialized equipment.

   2. Put the skate upright on a table, and check the position of the bottom
   toepick. The blade should also be touching the table within one or two
   inches of the toe pick. If the blade touches the table further back, it
   means that the toe-pick is too low (probably a consequence of successive
   sharpenings). If the blades touches closer than 1 inch, the master toe-pick
   may have been ground off. In this case, the blades will be useless for
   learning spins and jumps.

   3. Ask the skate sharpener at your rink to examine the blade. They can tell
   you if the blade is bent, incorrectly mounted or obviously damaged by abuse
   or bad sharpening.

   If the only problem is that the toe pick is too low, ask your shop to grind
   it some to raise it. Never have the bottom (master) tooth ground off your
   blades unless you only intend to use them for figures. Otherwise the tooth
   fairy will never forgive you!!

  5.3 Mounting

   Skates with improperly mounted blades can be virtually impossible to skate
   on. The blade must be correctly positioned and aligned on the boot. To avoid
   twisting the blade, the boot heel and sole contours must match the blade
   mounting surfaces. If not, the surfaces can be trimmed with a rasp, or shims
   can be added between the blade and boot.

   Briefly, this is how your skate shop will mount the blades:
   1)find the center of the tip of the sole and the center of the heel and draw
   a line joining them.
   2) place the front of the sole plate of the skate blade in line of the front
   of the sole of the boot, and maintain the skate blade along the line drawn.
   This will place the blade between the big toe and first toe.
   3) Screws may be placed only in the slotted holes, so that you can try them
   and make minor adjustments (a blade position slightly closer to the big toe
   is sometimes favored). Don't do any jumps until the best position of the
   blades has been found and more screws have been inserted.

    5.3.1 Problems with warping

   1. The blade may have shifted sideways slightly when the front or back pair
   of screws were tightened on the temp mounts, warping the blade from front to
   back.
   2. The holes for the permanent mounts might not be positioned perfectly,
   warping the blade as in #1 above.
   3. The heel might not be perfectly level or flat with respect to the front
   of the boot. Old screw-holes may have created bumps on the heel. Or the boot
   might have been manufactured with an uneven heel. Such a heel will twist the
   blade.

    5.3.2 Checking for mounting problems

   If you have trouble getting good edges, first have the blades checked to
   make sure they are straight, properly sharpened and mounted perpendicular to
   the sole. If the problem persists, have someone watch to see if your blades
   "make snow" as you try to skate on the edge in question. If they do, this
   may point to a mounting problem which can be corrected by a slight shift of
   the blade mounting. You will need to tell the person remounting your blades
   which edges you are having trouble with.

   You can also check if your blades are mounted correctly by yourself (you
   need recently sharpened blades for this test to ensure that the edges are
   even):
    1. Find a clean patch of ice
    2. Gather some speed and glide on two feet on a straight line. Keep your
       body upright. Your feet should be directly under your hips. Try this
       several times, both backwards and forwards
    3. Go back and look at the the traces: if the blades are set correctly you
       should get a set of double lines for each foot. If one of the lines is
       consistently thicker than its mate (or if there is only one line), it
       means that your weight on that blade falls predominantly on the edge
       tracing that line,i.e., the blade is unbalanced.
    4. If you are leaning mainly on the inside edge, have the blade shifted to
       the inside and vice versa. You probably only need a small shift -try
       moving it by 1 or 2mm and then repeat the test

  5.4 Rocker

   Rocker is the curve of the blade from toe to heel, and is based on the arc
   of a circle with a given radius. Thus, if you drew a circle with a 7 foot
   radius and placed a blade with a 7 foot rocker along the inside curve of the
   circle, it would line up with the tracing, at least at the rear (tail) of
   the blade. The curve at the front, behind the toe pick is somewhat sharper.
   It is this difference of curvature which allows you to turn and spin on the
   front of the blade.

   The smaller the radius, the more rocker (amount of back and forth rocking
   motion you can get when standing on the blade) it has. With small radius
   blades, you can do turns with less chance of falling as there is less blade
   on the ice. For the beginner, a 6' radius is fine as, among other things, it
   is very forgiving in the toe pick department -- you really need to lean way
   forward on them to catch the picks.

   The bigger the radius, the flatter the blade. This will generate more speed
   as more of the blade contacts the ice. You will want a flatter blade (7 foot
   or more) as you become more advanced. When you start learning jumps, you
   will find that you need good edge control. Because you have more blade on
   the ice, you can start to prepare your body position for takeoff without
   falling off the edge so easily.

  5.5 Grind or hollow

   Hollow or grind refers to the concave surface on the bottom of a correctly
   ground blade. A small radius creates edges that will dig deeply into the
   ice, while a larger radius digs in less, but glides more freely. A hollow
   with a 5/8'' to 3/4'' radius is recommended for beginners and "all purpose"
   skates. This hollow will allow you to sense how a proper edge should feel,
   and at the same time be forgiving in things like T-stops. The weight of the
   skater will also affect how deeply it should be ground: Usually children
   will need a deeper hollow than fully grown adults.

   Finally, the width of the blade is yet another factor to consider: A deep
   hollow with a 3/8'' or smaller radius will be UNFORGIVING on freestyle
   blades, unless you are a child or have a very petite frame. This type of
   grind may yields crisp and fast 3-turns, ability to hold a very deep edge
   when landing jumps, and allows for fast spins IF you have them centered. An
   uncentered spin on deep edges will cause you to travel. See about traveling.
   On the other hand, such a small radius will be ideal for dance or hockey
   blades: Because these blades are narrower than freestyle blades, the need a
   deeper grind to get the same grip on the ice.

   A shallow "figure" hollow with a 1'' or larger radius will require a more
   correct lean to prevent skidding and requires more frequent sharpening, but
   yields an easy glide and clean tracings.

  5.6 Advanced blade features

    5.6.1 K-pick

   The K-pick design consists in a set of extra 3-4 picks to the side of the
   standard toe-picks. This feature is supposed to provide more control and
   better anchorage to the ice on toe-jumps. According to blade manufactures,
   the jump height can increase by 5-10% and the jump length by about 20% on
   toe loops and flips. No significant improvements in height and length have
   been reported for the Lutz, although the improved stability on the take-off
   supposedly makes for more consistent jumps. Many freestyle blades models,
   particularly at the high end range, are available with K-picks.

    5.6.2 Side honed, parabolic and tapered blades

   Most skating blades have the same constant width along its full length.
   However,  some advanced freestyle figure skating blades have a concave
   section ("side honing"). Side honed blades are thicker at the stanchions and
   the edge stripe and thinner in between. You can tell side honed blades
   because reflections appear inverted.

   Another  modification  to the edge profile found in advanced blades is
   "tapering". Tapered blades are thicker at the front near the toepicks and
   thinner at the tail, i.e. the edges are not parallel. Parabolic blades are
   thinner in the middle section and thicker at both ends. Some models or
   custom made blades can be both side-honed and tapered.

   These modifications make the blade lighter (because of the removed steel)
   and supposedly provide a better grip on the ice. Not surprisingly, the more
   laborious manufacturing process translates in a higher price. Whether they
   actually provide any real advantage is a matter of discussion.

  5.7 Sharpening explained by an expert

   Take your skates to a pro shop or ask some regular skaters at your rink
   where they get theirs sharpened. Skate sharpening is NOT a do-it-yourself
   project! Skates are expensive and it only takes one bad sharpening to turn
   them into scrap metal!
   1) You have to know and trust your sharpener,
   2) Your sharpener has to know you and your needs,
   3) You have to stand guard over your skates until they are sharpened by the
   proper person.

   Skates  properly sharpened will have a smooth concave grind accurately
   centered along the length of the blades, edges squared (parallel to the
   bottom of the boot) and level with each other (inside edge at same height as
   outside edge) for the length of the blade. Proper sharpening will maintain
   the correct rocker for the life of the blade.

   Freestyle sharpenings will have typically a 1/2'' radius concave grind and
   will be in a sharp condition. The edges of a deep freestyle grind have the
   great advantage of holding jump landings on hard or soft ice and also will
   outlast a shallow grind by a considerable amount of time. They will also
   hold landings on missed jumps and give the skater that extra split second to
   catch their balance and avoid unnecessary falls. A sharp deep grind takes a
   little effort on the part of the skater to adapt but is well worth the
   effort and once adapted to it will be no problem in future sharpenings.

   Figure sharpenings will have 1 1/4'' radius concave grind and will be in a
   medium sharp condition. The figure grinds are extremely smooth and flow
   freely on the ice. More shallow (greater radius) grinds have extreme flow on
   the ice but are usually suitable only for the more advanced skater.

   Combination sharpenings will have 3/4'' radius concave grind and will be in
   a medium sharp condition so that the skater can skate figures with ease or
   they can be used for general skating. The grind will be of smooth finish and
   will flow quite freely on the figures (although not as freely as a true
   figure grind). This grind can be used for all jumps and spins and will hold
   well while blades are in a sharp condition. This grind is also very suitable
   for occasional skaters and some dancers; and is also good for adults to
   start with.

   Skates should be resharpened before they become so dull that you begin to
   slip on hard ice (eg: not flooded since last night). This will also minimize
   the adjustment you need to make to your newly sharpened skates. Nicks in the
   blades should also be attended to. Bad nicks in the edges will ruin the
   finest sharpenings.

   When  the  blade is ground down a long way after many sharpenings, the
   relationship between the bottom pick and the blade edge should be maintained
   by removal of steel from the pick. There should be about 1/2'' lift at the
   heel before the pick makes contact with the ice. Just because your blades
   are ground down past the line of chrome plating, that is not an indication
   that you need new ones. There is still lots of life left as long as the
   sharpener replaces that "line" and adjusts the pick height.

   Beware of how some shops do their sharpening: Some shops flat-grind the
   blade first, and then hollow grind. This wears the blade at an accelerated
   rate.

  5.8 Maintenance

   There  are  two  kinds of blade covers, hard rubber/plastic guards and
   terry-cloth "soakers". The plastic guards should be worn *any time* you step
   off the ice. Even "safe" rubber mats or carpets accumulate dirt and grit
   from the shoes of pedestrians, and this grit will nick and round off the
   fine edges of your blades much faster than gliding across the ice. Do not
   leave them on your skates between sessions as they will trap water and cause
   your blades to rust.

   The cloth soakers are put on after you have removed your skates and wiped
   them dry with a rag. They protect your blades from bumping in transit and
   wick away any condensation so your blades won't rust. If you still have
   problems  with rust or want to store your skates, rub a drop of oil or
   Vaseline along the bottoms of the blades.
     _________________________________________________________________

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