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  • Lathe Technical Specifications
    of this page and through text links within the body of the pages Most of the specifications are common to all lathe models though with some obvious exceptions The DB800 and DB801 being bench mounted feature little in the Bed Stand section On the other hand whilst the Bowl Turning Attachment is normally fitted only to the DB1000 and DB1200 models and DB800 801s mounted on the optional stand it can be perfectly well fitted to bench mounted DB800 801 lathes given a modicum of forethought when building the support bench The topics covered in this section are The Headstock Spindle The Drive system including the motor and Vario controller The Bed Stand The Toolrest and Bowlturning including the Bowl turning attachment The Tailstock The range of standard Accessories The Ornamental Turning System Components The Copying and Fluting Attachment If questions arise please feel free to drop me an email and I ll do my best to advise Alternatively you may wish to download the latest eleven page WivaMac Lathe Brochure in pdf format by clicking the image to the right 1997 2009 P Hemsley The information on this website is the copyright property of Peter Hemsley Coeur du Bois

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/technical_specifications.html (2016-04-28)
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  • Headstock & Spindle
    workpiece A full height transparent door covers the drive belt area and gives ample access for belt changing whilst permitting the current belt setting to be seen instantly at all times Belt tension is essentially self adjusting with just one lever to lock the motor in place after changing belt positions Lathes built for professional use need to be tough and capable of arduous duty This is achieved by the use of very substantial deep groove precision ball bearings operating back to back Reference to a design manual will show that this not taper roller bearings is the preferred bearing type for use in a lathe Despite our most muscular efforts axial loads on a woodturning lathes are relatively low whereas axial loads are reasonably high and high speed operation is a must To keep bearing loads low the bearings are widely spaced The large diameter spindle pulley bosses of the lathes carry a ring of 24 holes which provides high precision indexing of head position except DB802 There is also a convenient spindle locking function provided on all models independently of the indexing To make it easy to take advantage of these facilities the rear of the spindle carries a smoothly machined aluminium handwheel for rotating the spindle by hand a very useful feature as one s work develops and more involved creative methods are used The headstock is through bored and opens into a 2 MT throat for drive centres etc The standard spindle thread is M33 x 3 5 mm which is becoming the universal thread for larger lathes as a special order option the lathes can be supplied with a spindle finished with a 1 x 8 t p i thread Finally it may be worth reiterating the fact that all of the DB series lathes

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Headstock___Spindle/headstock___spindle.html (2016-04-28)
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  • Drive
    is multiplied i e increased by interposing a mechanical drive between the motor and the spindle When we are turning the force we apply through the tool is resisted and the workpiece kept turning by the torque of the motor NB NOT the power of the motor this is simply a measure of the amount of torque applied the work done in a certain time Torque and power are related but only by bringing the rotational speed into the equation for the technically minded in imperial units Torque lbs ft HorsePower x 5250 Speed in revs per minute The truth is that an electric motor is an imperfect device like most mechanical devices and as the operating speed is reduced the torque output by the motor torque being the turning moment or rotational force drops dramatically Hence the torque available to drive the workpiece drops proportionately and suddenly the user can find himself able to stop the lathe with a little finger Modern sophisticated electronics go some way to resolve this problem but there is an economic limit to the energy that can be provided to drive the motor before the motor literally fries What actually happens in a variable speed drive system is that the operator you sets a value that represents the speed at which you wish to turn the speed controller then outputs electrical energy to the motor and measures the resulting speed it does this measurement many times a second If the measured speed is too high the power output is reduced if too low the power delivered is increased until the set speed is achieved At some point a limit is reached where the energy being delivered to the motor is the maximum that can be allowed before frying commences and this defines the limit of torque availability from the motor What is really needed is a way of multiplying the torque available to drive the workpiece it is this that is achieved by coupling the motor to the spindle through the step pulley drive transmission Quite simply torque is increased so that the risk of stalling is obviated Each step of the pulley system affords the user a wide range of speed variability significantly more than is likely to be required for any one job but that speed range can be optimised for any particular job Direct drive systems however sophisticated cannot by decree of the laws of nature mechanics ever be as effective in the delivery of torque as can a greared drive Remember in conjunction with all of this that the larger the workpiece diameter the slower the spindle needs to be turning in order that the peripheral speed of the workpiece is optimised for best turning The optimum for hand turning is reckoned to be 25 ft sec that means that for a 3 diameter workpiece a speed of 1910 rev min is desireable whereas when turning a big bowl at 15 diameter you need to be able to reduce the

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Drive/drive.html (2016-04-28)
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  • Bed & Stand
    generously cross braced It is deep in section to resist the loads imposed on the bed by the turning activity yet relatively slim in the lightly loaded front to rear plane to maintain easy access The top surfaces of the bed are plated with substantial 15 mm thick flat bar stock which also provides the clamping lip and a smooth surface upon which the toolrest bracket tailstock and headstock can be moved with ease yet locked with the action of a single hand Many lathes are designed around easily obtained round tubes and bars since these are easily built into a lathe but they are the opposite of what is required in terms of the structural stiffness of a lathe bed For the technically minded such beds place the bulk of the material on the neutral axis of the bed where it has least effect on its stiffness the deep structural section bed of the Wivamac lathes places the material where it can be employed to best effect well away from the neutral axis in the top and bottom flanges of the bed This provides yet another simple insight into our assertion that these are lathes designed with care by a company that cares about turning and understands engineering Quality is the watchword The stand is rigidly bolted to the bed assembly but can be removed for transport whenever this may be required Lathes are normally delivered with the stand separate for assembly by the user saving cost in transport and easing manhandling the lathe to its installation location We must not pretend that these lathes are lightweights they are not You ll need a pal or two to get the lathe installed without too much grunting Of course the DB800 801 is designed for bench mounting so these particular

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Bed___Stand/bed___stand.html (2016-04-28)
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  • Toolrest & Bowlturning
    toolpost socket to be moved bodily independent of any movement of the banjo itself to bring the front face of the toolrest into the closest proximity to the working face of the workpiece regardless of the plane in which that face lies as illustrated in the photograph left In this position the toolrest front face projects beyond the front face of the banjo meaning that the full capacity of the lathe can be used for instance in turning huge platters without any risk of the banjo fouling the workpiece even when the toolrest is in close proximity to the workpiece to give maximum tool support Yet another WivaMac innovation setting the pace which others to seek to match Toolrests in both steel and cast iron are available in a wide variety of standard lengths ranging from 100 mm to 600 mm with the longest 600 mm being used with a second banjo to ensure a robust fixing A 900 mm dual post rest is available to special order There s even an offset bracket available for use in cases where you need to work around the corner yet keep the banjo in front of the workpiece When bowl turning becomes your thing and you regularly want to turn substantial bowls and hollow forms then it may be time to look at the Bowl Turning Attachment usable with both the DB1000 and DB1200 as photographed at the head of this page This accessory makes access to large bowls and hollow forms very easy without having to crane over the bed or work with the banjo extended over the front of the bed It can be seen that this is not a bolt on goodie type attachment but a really sturdy and workmanlike extension to the lathe that quite simply converts the

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Toolrest___Bowlturning/toolrest___bowlturning.html (2016-04-28)
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  • Tailstock
    6000 quill permits auto ejection of suitable Morse taper equipment as the quill is returned to the retracted position Both designs of tailstock are of cast construction The DB1209 tailstock above left is provided as standard on the DB1200 and on the DB1000 series lathes Whilst there are no technical reasons why it could not be used on the DB80x lathes it is felt that for most users the reduction

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Tailstock/tailstock.html (2016-04-28)
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  • Accessories
    steady of high quality to match the lathe without compromise The steady bolts directly onto the bed and features three adjustable fingers each carrying a bearing wheel upon which the workpiece freely rotates Turning perfect spheres is a task in which some turners take great pride and is often seen as a mark of competence among turners Those of us with less well developed skills may find that the use of the Wivamac sphere turning jig and centre finder brings this task into the realm of the possible Again designed and built specifically to suit this range of lathes this is a robust and well engineered accessory that many will find a boon to their turning vocabulary Although the Vario system allows the lathe to be run in the reverse direction owners of the standard drive versions excepting DB800 may specify the installation of a neat reversing switch to achieve this objective This facility can be very helpful when attempting to refine the surface of a piece using abrasives when it may well be found that reverse sanding will remove grain pick up and fur that otherwise refuses to be touched by the abrasive The accessories described here are in

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Accessories/accessories.html (2016-04-28)
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  • Ornamental Turning
    locked in this axis and the cutter is mounted in the lathe spindle The DB1420 Ornamental Turning Device see large photo left performs this function and may be considered as the heart of this OT system The DB1420 mounts in the adaptor on the compound table and provides a rotating spindle the axially rotational position of which is governed by a 24 60 hole indexing plate and an M33 x 3 5 mm thread to allow a chuck or faceplate for instance to be mounted on the spindle to hold the workpiece Also provided is a cutter carrier which mounts on the main spindle of the lathe and which has a series of mounting holes for the toolholder allowing it to be set at various offsets from the axis of the lathe spindle hence the tool tip describes a circle about the lathe axis as the lathe spindle rotates By progressively rotating the workpiece held on the DB1420 spindle and locking it in position at discrete intervals using the indexing plate decoration etc can be applied in a regular pattern around the workpiece using tooling held in the headstock spindle mounted toolholder The exact planes of intersection between the workpiece and the locus of the cutter can be adjusted by moving the DB1420 by indexing the compound table along either of its axes of freedom Using a somewhat similar principle the DB1430 Thread Cutting Jig allows threads to be cut on a workpiece which is held in a chuck mounted on the special spindle of the jig which advances 2 mm with each full revolution i e the spindle acts as a 2 mm pitch leadscrew A cutter with a 60 degree included angle and 8 mm shank is held in a small chuck mounted in the lathe s main

    Original URL path: http://www.toolpost.co.uk/pages/Lathes/WivaMac_Lathes/Technical_Specifications/Ornamental_Turning/ornamental_turning.html (2016-04-28)
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web-archive-uk.com, 2016-10-25