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11th March 2018, 08:20 PM #1Most Valued Member
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- Aug 2015
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Surface Grinder Adapter Thread Differences
My Kent SG came with one adapter fitted with one wheel installed on the spindle.
As a first step in building up a set of wheels and adapters I purchased a cup wheel from Blackstones and a new adapter from Kent (Taiwan).
The washer on the new adapter was too big for the cup wheel so I made a new nut and washer.
Tried the cup wheel out on the new adapter, no problems.
Got some old wheels from a friend and purchased a new wheel through another friend from an industrial supplier south of Sydney, so started playing around with various combinations - problem.
I now have 2 adapters - old and new, and 3 nuts - old, new and made.
The fits are: adapter old, new
nut old: Ok, Ok
nut new: NBG, Ok
nut made: NBG, Ok
Measured the nominal M30 x 1.5 thread with micrometer over OD and 0.040" thread wires:
OD, Thread Dia
Old: 29.79, 30.76
New: 29.73, 30.51
Measured the nuts with internal micrometer:
Old 28.70
New 28.63
Made 28.44
The new adapter thread is significantly smaller than the old adapter thread.
My made nut used the new adapter as the gauge - wrong call.
The problems keep us on our toes, and a couple of photos of the measurement are attached.
The pads holding the thread wires are blue tack.
Thread Wires 180311 compr.JPGAdapter Thread Pitch Dia 180311 compr.JPG
John.
Attached Images
- Thread Wires 180311 compr.JPG (45.5 KB)
- Adapter Thread Pitch Dia 180311 compr.JPG (56.4 KB)
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