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3"-4" Starrett 436 micrometer: When spindle

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Do you still have the locknut wrench? you need to loosen the spindle. if not try an industrial supply store to get wrench.


hope this helps

thanks

Posted on Mar 25, 2011

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How do I fix a loose blade.


By loose blade I assume you mean that it can be moved up and down at the tip of the blade. It is most unlikely that the central nut has come loose, but check anyway. If this nut is tight and the shaft is loose in the bearing this means the bearing has worn out. Remove the deck from the machine. Photograph the run of the belt as this has to be removed. Also the direction of the grease nipple. Remove pulley from loose spindle. Turn deck on its edge or mount on two saw horses or similar so you can get to top and bottom of spindle bolts. Remove cutting blade. Remove spindle housing and clean area so no rubbish gets caught when reassembling. Otherwise spindle may be set different and mower will leave a line of differing cut. Take spindle to vise and remove any retaining nuts or circlips from shaft and clean as clean as new. Apply light oil or CRC etc to help move bearing along shaft. Open vise wider that outside of bearing, usually 44 to 50mm [1 3/4" to 2"] and refit nut on thread. Check nut is always spaced free of top bearing. With cushion of hardwood or nylon tap the shaft to move it down with lower bearing coming out of spindle housing. To remove top bearing from housing, turn housing up other way and use a wooden shaft such as a broom handle to tap bearing free of housing. Clean out grease and replace when reassembling. Do not reuse other bearing. They are cheap and likely to fail shortly anyway. These bearings usually have no seals on inside.

Sep 27, 2014 | Garden

1 Answer

Starrett no. 440 depth micrometer turns hard, and the lock nut is not the issue. it even turns hard when the style rod is completely out of it. I think it may be a little rusty on the inside.


Sounds like you might be on the right track in thinking there is some corrosion. Do you use the micrometer regularly? Did this problem appear suddenly? Try a little WD-40. If rust is significant, i recommend using some naval jelly to remove it. Remember, when it comes to precision instruments such as this, moisture is not your friend.

Hope this helps.

Apr 27, 2011 | Garden

1 Answer

How do I calibrate a Starrett model 449 depth micrometer?


Try the starrett web site. You can chat with them there about it. The adjustments are fair easy to do.
http://www.mytoolstore.com/starrett/micro029.html

Nov 12, 2010 | Starrett 50443 12 Machinists' Improved...

1 Answer

I lost my owner's manual and need to know how to reset the micrometer to zero


This is based on an old Brown & Sharp guide book. 1. Carefully clean the measuring surface by pulling a piece of soft paper between the surfaces while the anvil and spindle are in light contact with it. 2. with the anvil and spindle apart, unlock cap with spanner wrench (supplied with unit), then tighten cap lightly with fingers to bring slight tension between thimble and spindle. 3. Bring anvil and spindle together by turning SPINDLE and set zero line on thimble to coincide with line on barrel. 4. Move spindle away from anvil by turning SPINDLE, NOT by turning thimble. 5. Holding thimble only, tighten cap with fingers. Do Not Touch Frame. Lock cap with wrench, still holding thimble only, and adjustment is complete. NOTE: Check zero setting after adjustment is made. Hope this helps

Jun 04, 2010 | Mitutoyo #117 107 0 1 Uni Mike Micrometer...

2 Answers

Spindle movement jammed


it has something stuck in it...do not try to force it
send it to an authorized Starret repair facility to be repaired

May 16, 2010 | Starrett T216XRL-1 - MICROMETER, DIGITAL

1 Answer

How do you change rear bearing on axle


1. first you must take off the wheels.
2. Now remove the caliper and then slide off the rotor.
3. remove the cotter pin on the hub and the lock collar then with a impact remove the 36mm nut on the shaft.
4. there are 4 bolts on the rear of the hub. rotate the axles so that you can remove them.
5. once these are removed, grab the spindle and shake it loose off the splines.
6. the tuff part is pressing the bearings off the spindle. I used a hydralic press to do it. the only pain was that the inside race of the bearing wouldnt come off so I had to cut it off.
7. now press it all back together. make sure it is all the way to the stop
of the spindle.
8. reinstall it back to the hub, those 4 bolts, not forgetting to clean off splines.
9. Now the spindle nut must be torqued down to at least 206 ftlbs and no more than 276 ftlbs. after that is down add the lock collar and install a NEW cotter pin.
10. reinstall rotor and caliper and wheel.

hope it helps-

Aug 16, 2009 | 1987 Nissan 300ZX

2 Answers

Micrometers out of calibration


Micrometers must be calibrated at 4 spots around the barrel and at zero and full scale to be truly accurate. You will have to send it to a calibration lab or back to Starrett for a full calibration because they will check it with gauge blocks of known length and verify the spindle and anvil surface flatness.

If you are only concerned with the zero and not as much about the full accuracy of the tool, then you can reset the zero yourself. With the mic fully closed (spindle and anvil touching), turn the barrel with the funky, half circle shaped wrench that came with the mic in the box. There is a little hole in the barrel where the nub on the wrench will fit then you just turn it until it reads zero. Good luck.

Mar 07, 2009 | Starrett T216XRL-1 - MICROMETER, DIGITAL

2 Answers

Micrometer trouble


My experience in this type of repair spans over 18 years of Calibration experience in working for a Major Automotive Supplier.
So I will attemp to walk you through this. There are several different models of micrometers and each manufacture has a different design. Most of my expertise is with Mitutoyo, Bown&Sharp and Starrett. There could be a couple of other under lying problems due to the "overtightening".
One: could be due to a scratch on the spindle "barrell" from trying to rotate the spindle when it was locked.
Two: the spindle could actually be bent.
Three: If left in the lock position for a period of time, it could have a slight bit of corrosion on the spindle.
If at all possible, remove the lock, loosen the spindle and remove the spindle completely. Place the spindle on a known flat surface. If you have a granite surface plate that would be perfect, if not try a smooth glass top. The idea is to check the spindle to see if it is bent by rolling it and checking for straightness. If it is bent or badly scratched, then it would be cheaper to just purchase a good micrometer from eBay than to try and get parts.
If it is not bent then it could be corrosion so clean with a pure grade alcohol and reassemble.
If you still have the tightness, then it could also be an alignment issue and that is just going to take a lot of patience, and it still may be cheaper in the long run to replace it.
Most precision mics will not tolerate harsh treatment or environments, so be careful..........hope this helps....

Jul 31, 2008 | Fowler Outside Micrometer Set 0 - 4"

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