TOOL POST GRINDER

SYNOPSIS 
 Everyone knows a tool post grinder is one mighty handy item to have as an
addition to a lathe, how ever, if you ever priced one, you know they run in to some
serious mounts of money. So, with this in mind, I set off to build my own. Pictured
below is the outcome of that project. I have to say the tool post grinder works extremely
well. By varying the pulley sizes I can get a high end speed of over 10,000 rpm if needed.
The only change I would make is to have a totally enclosed motor to keep out the grit. 
INTRODUCTION 
Our project is design and fabrication of Multi Use Tool Post Grinder. It is used to
grind the machining surfaces to super Finish and accuracy. It can be used as an internal
and external Grinder by fixing the attachment on the Carriage of a centre Lathe. The
principle parts of this attachment are main body, Spindle shaft, bearings, rope pulley and
grinding wheel etc
NEED FOR ATTACHMENT 
Generally some components in engineering field require high surface finish and
accuracy. For example a cylindrical part requires high finish inside the bore or outside
the body, it requires cylindrical grinding machine and centre less grind machine. The
above machinery cost will be more, and also unless we have lot of similar jobs, we equity
keep these costly machines idle. To avoid this heavy investment and also to fill our
requirement in grinding of such above jobs, we can manufacture this attachment.
As the cost of this attachment is less, we can keep this idle when we don’t have
enough jobs. There won’t be any loss for us, due to this attachment.


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WORKING PRINCIPLE 
This attachment is used on centre lathes. This whole arrangement is fixed on the
carriage where the component rests. A grinding wheel is mounted on the spindle which
is supported by two bearings, and is rotated by a motor through ‘V’ rope in high
revolution. 
Tool Post Grinder Mechanical Project
Tool Post Grinder Mechanical Project
While we are introducing the rotating grind wheel inside the bore of a job which is
also rotating on the chuck, Material will be removed according to the cut which we
select. The operation is similar to grinding operation. In turning, a single point tool
removes the material, but in this process, a grinding wheel is used to super finish the jobs,
where high accuracy is necessary.
WORKING OF UNIT 
This attachment is fixed on the lathe carriage, where the compound rest rests. The
spindle of the attachment will be parallel to the lathe spindle. It is just like a boring bar
on tool post. Where the motor is on, the spindle and the grinding wheel will be rotated,
on the RPM of about. Job is held on the lathe chuck, for example, if we grind a bore of a
body, the body will be rotating in lower RPM on lathe spindle, and the grinding wheel
will be rotating on higher RPM. The rotation of the grinding wheel will be opposite to
the job rotation.
Depth of cut may be given by cross slide, and the longitudinal movement will be
given by automatic feed. Normally depth per cut will be 0.02 to 0.05 MM.
ADVANTAGES
1. The attachment is compact and rigid in size.
2. Maintenance is less.
3. It can be used on any lathe by small change in centre heights.
DISADVANTAGES
1. This attachment is not used for taper job to grind but it can grind by using extra taper thread turning attachment.
APPLICATIONS
1. Grinding inside the bore in any size of body can be done.
2. As the feed is given automatic, 0.8 micron finish may be achieved.
3. By changing the grades of grinding wheels it can be used to grind the carbon steel, Alloy steel and stainless steel etc.
FIELD OF APPLICATION
Wherever grinding finish is required it can be used. For example, bore of industrial valves, outer diameter of spindle of varies machines.

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