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Tilstand: Pent brukt – I god stand
Liten metall dreiebenk. Har brukt den kun et par ganger og laget et par trinser til Elusaga mi. Emco Unimat 3 klone. Automatisk mating . Fin hobby benkemodell til å dreie småting i messing, plast o.l. Svært lite brukt, og den kan sendes som Norgespakke.
Fra nett:
MJ-189 is the name of a Chinese clone of the european EMCO Unimat 3 and 4. This clone turned out to be just as good as its European cousins but at a much more attractive price. It uses the same attachments and accessories so they can be readily purchased. The following table gives some further specifications.
Center height (mm)
45
Length between centers (mm)
250
Swing over bed (mm)
90
Swing over cross slide (mm)
62
Chuck mount
M14x1
Taper inside spindle
No
Taper in tail stock
M14x1
Length (mm)
280
Depth (mm)
200
Hieght (mm)
220
Weight w/o Stand (kg)
10
Motor (W)
100
In addition to the basic functions that makes the machine into a lathe some necessary functions, useful functions, and desirable function that will make the machine even more cersatile and useful. The following table lists those groups of functions for the MJ-189.
Necessary Functions
Exist
Thread Cutting
Acc
Back gear
No
Lead screw rotation change
Yes
T-slotted cross slide
Yes
MT 2 in Tail Stock
No
tailstock for taper turning
No
Saddle hand wheel
No
Useful Functions
4-way Tool Post
Acc
Gap-bed
No
Hole through spindle (mm)
10
Thread dial on lead screw
No
Spindle Lock
No
Autostop on Saddle drive
No
Can use Collets
Acc
Graduated Tail Stock
No
Desirable Functions
Screw Cutting Gear Box
No
Cross Slide Autofeed
No
Clutch for Spindle
No
Cooling Equipment
Yes
Graduated Handles
Yes
Lever Feed Tail Stock
No
Speed Regulator
Acc
*Acc = Accessory
This little machine does not have many built-in functions, but instead a wide range of accessories to supply most of them and a few more. Today it seems like it is not possible to find a new MJ-189 but SIEG makes a machine called C0 and is of the same size. The only main difference is that the C0 has a 150 W motor and electronic speed control.
Modifications
To make my machine even more versatile I have made a few small modifications as described below.
Surface Plate for Thin Jobs
This is a completly flat surface plate used with double stick tape for careful machining of thin jobs. Made from a piece of 10 mm aluminium plate to fit directly onto the spindle.
Very useful both with tape and tail stock support.
Building Instruction here.
Swarf Tray
As time passed I got tired of all swarf that spilled around the lathe and down on the table. It became a task to keep the work space clean. The solution was to make a swarf tray to catch and keep the swarf in place.
The swarf tray is the red "plate" on top of the red stand. After adding this it became much easier to keep things in good order and less cutting fluid all over the place.
Building Instruction here.
Quick Change Tool Post, Norman Patent Type
I got fed up with keeping track of shims to get the cutting tools at heght and the original tool holder felt wobbly in some cases. Time for a solution. The best was to make a completely new tool holder for easier tools change between tools on the same mount. I choose a type called Norman Patent where a round post is used onto which individual holders with separate height adjustment are clamped.
The solution turned out to be very good! Stability clearly increased and with the built-in height adjustment it was easy to keep all tools at the correct center héight. I made holders for the following types of tools:
5 x Ordinary straight cutting tools
2x boring tools (one for 6 mm and one for 10 mm)
2x Knurling tools
All holders have height adjustments so it is only a matter of setting the height with a screw and lock it when correct. To change a tool, unlock a holder from the post and slip on another and lock it - done.
Building Instruction here.
Live Centers
In some cases it is very useful to have live centers of other shapes and sizes than the original. They are not difficult to make, not even live ones. After finding a tip in a book I made the one below.
I also added room for the original fixed and live centers. I made the following types:
Fixed half center to get really close with the cutting tool.
Pipe Center for larger holes or pipes.
Push plate to use either as push plate or as flat center
Reversed center with a center hole to support thin or conical work pieces.
holder with ball bearing to make the tips live.
All is made in steel and are very useful accessories.
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Sist endret: 19.9.2024, 04:54 ・ FINN-kode: 371308948