Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Angle Calibrated Wrench 3
- Thread starter drawoh
- Start date
My thoughts went immediately to "stepping motor".
Have the electronics set up so that each time you push a button you get a one degree movement. Note that the "base" mount has to be quite rigid rotationally as the incremental movement is so small. Check for backlash.
If the stepper motor does not have one degree steps itself some "gearing" (mechanical or electronic) might be required.
Have the electronics set up so that each time you push a button you get a one degree movement. Note that the "base" mount has to be quite rigid rotationally as the incremental movement is so small. Check for backlash.
If the stepper motor does not have one degree steps itself some "gearing" (mechanical or electronic) might be required.
-
1
- #3
Don't know if this is suitable or not...
Regards,
Mike
Regards,
Mike
-
1
- #4
- Thread starter
- #5
-
1
- #7
There are newer torque wrenches with internal gyroscopes that measure angle very precisely.
- Thread starter
- #9
desertfox said:
That is what we are doing now. The scale is a piece of cardboard with a cutout for the wrench. The engineer doing the alignments insists that she has a delicate touch developed from years of doing optical alignments. She has no idea of how she is going to train someone else to do this.
If I have to design something, I am going to pay close attention to the rigidity of the wrench, and I am going to look into lubricating the adjustment fasteners. I will try to clamp to the fastener rather than just insert something inside or around it.
Several of the links look very interesting.
Could you use something like this 10 turn knob. They also make 100 turn knobs.
Here is a pretty good selection of turn counting dials available.
As I don't know your actual configuration you might want to look at differential screw mechanism.
This is just one of many configurations available.
As I don't know your actual configuration you might want to look at differential screw mechanism.
This is just one of many configurations available.
Hi drawoh
Well it doesn't sound as though your set up needs to be absolutely accurate and I'm not sure I agree that no one else could do what your present engineer is doing even she had to start somewhere.
Another way of doing your angle measurement would be a known pitch of a thread and use a DTI to measure linear movement as you rotate the thread.
desertfox
Well it doesn't sound as though your set up needs to be absolutely accurate and I'm not sure I agree that no one else could do what your present engineer is doing even she had to start somewhere.
Another way of doing your angle measurement would be a known pitch of a thread and use a DTI to measure linear movement as you rotate the thread.
desertfox
- Thread starter
- #14
desertfox,
I have forwarded some of the catalogue pages noted above to her. I am waiting for a response. I intend to ask about lubricating the screws in the alignment fixtures, which ought to make for better accuracy (and less stability).
I have designed alignable fixtures in the past where I have defined the resolution with respect to a 1/4" movement of the end of a 6" wrench. Is this what you are referring to?
JHG
I have forwarded some of the catalogue pages noted above to her. I am waiting for a response. I intend to ask about lubricating the screws in the alignment fixtures, which ought to make for better accuracy (and less stability).
I have designed alignable fixtures in the past where I have defined the resolution with respect to a 1/4" movement of the end of a 6" wrench. Is this what you are referring to?
hi drawoh
Yes I suppose, for a given pitch of thread you can work out the angle turned through for a given linear movent, so I was suggesting putting a dial test indicator at the end of a threaded rod and using the linear movement to achieve the angle required.
desertfox
Yes I suppose, for a given pitch of thread you can work out the angle turned through for a given linear movent, so I was suggesting putting a dial test indicator at the end of a threaded rod and using the linear movement to achieve the angle required.
desertfox
- Thread starter
- #16
Hi drawhoh
What are the tolerances your looking for on this adjustment, ie increments of 1 degree +/- ? also is the linear movement important in terms of the alignment or is it just a means of getting the angle correct? if its just getting the angle correct can you use a larger pitched thread.
desertfox
What are the tolerances your looking for on this adjustment, ie increments of 1 degree +/- ? also is the linear movement important in terms of the alignment or is it just a means of getting the angle correct? if its just getting the angle correct can you use a larger pitched thread.
desertfox
- Thread starter
- #18
Hi drawoh
Probably stating the obvious (GRIN) but you will probably need some parameters if you need to design a device.
I've had a few jobs like yours where people want somthing but don't really know exactly what they want,"never ending goalposts" is a phrase that comes to mind.
good luck
desertfox
Probably stating the obvious (GRIN) but you will probably need some parameters if you need to design a device.
I've had a few jobs like yours where people want somthing but don't really know exactly what they want,"never ending goalposts" is a phrase that comes to mind.
good luck
desertfox
MikeHalloran
Mechanical
I used to have a distributor-points setting tool that could do 1 degree, easy. It comprised a pin that stuck into the center post of the distributor cap, a sticky gimbal to compensate for non-vertical axes, and a 3"+ diameter magnetic compass. Level the compass, zero the dial, then twist the distributor to the angle you want.
It also had a built-in continuity tester for setting the points, but you don't need that to measure a wrenching angle. You do need to orient the workpiece so the fastener axis is nearly vertical.
... OR use a really fine pitch thread, like you typically find in optics,
... OR tilt the screw and use it to drive a wedge.
Mike Halloran
Pembroke Pines, FL, USA
It also had a built-in continuity tester for setting the points, but you don't need that to measure a wrenching angle. You do need to orient the workpiece so the fastener axis is nearly vertical.
... OR use a really fine pitch thread, like you typically find in optics,
... OR tilt the screw and use it to drive a wedge.
Mike Halloran
Pembroke Pines, FL, USA
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question
