+- MetalworkingFun Forum (http://www.metalworkingfun.com)
+-- Forum: Machining (http://www.metalworkingfun.com/forum-5.html)
+--- Forum: Projects (http://www.metalworkingfun.com/forum-7.html)
+--- Thread: Todays Project - What did you do today? (/thread-727.html)
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
RE: Todays Project - What did you do today? - TomG - 01-28-2013
We got four or five inches yesterday, but when I woke up this morning there was 1/4" of ice on top, so it took half an hour to get the car chiseled out and an hour to get to work. Now I hear it's supposed to be 60ºF tomorrow, so it'll all be gone, then back to the teens on Friday...typical Michigan weather. Hope all the windows don't break in the house from the thermal shock.
Tom
RE: Todays Project - What did you do today? - Highpower - 01-28-2013
Today was "build a lapping machine day".
A couple of chunks of wood, a cheap 1/4 hp eBay motor, a slug of cast iron round stock, a few electrical bits, a leftover piece of DIN slotted rail and a bit of drill rod. Wallah!
![[Image: Lapping_Machine.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Shop%20Projects/Lapping_Machine.jpg)
The top of the wood block "tool rest" is cut at a -5° angle to provide a 85° cutting edge for a carbide hand scraper blade. The slotted rail "tool guide" is used to provide the arc needed for the radius on the front of the cutting blade. The short piece of drill rod serves as the pivot point on the guide. I just put a couple of fusion tack welds on them to hold them together.
With the pin in the farthest hole from the lapping disc on the tool rest, it is used with the "long" end of the guide facing the lap surface. This gives a 90mm radius for "rough" scraping. Turning the guide around and using the "short" end of the rail facing the lap, putting the pin in the closest hole on the tool rest gives a 60mm radius for "finish" scraping.
At least that is what I have learned so far...
Now I need to make a similar guide to fit on my pedestal carbide grinder in order to do the initial shaping of the scraper tip before I can lap it. The new blades are supplied with flat 90° surfaces. And I suck at hand grinding radius's......
![[Image: 60_degree_radius.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Shop%20Projects/60_degree_radius.jpg)
RE: Todays Project - What did you do today? - Mayhem - 01-29-2013
Nothing really special here, just a simple fix that would have been much more difficult without a lathe.
One of the exploders I use has a problematic key switch that I needed to replace. I couldn't get a key that has the same 19mm barrel with the key being captive in the on position (a necessary safety feature), so I had to use a smaller key switch.
In order to make it fit I turned up a top-hat and backing washer to fill the 19mm hole and allow the 12mm key switch to be used. The most time consuming part was melting the scrap aluminium to make the stock from which it was turned :) I was actually surprised, as I expected some porosity given that I didn't add any flux. All it did was skim the crud off the top before the pour!
OK - well the pics are pretty crappy, as my phone doesn't appear to like macro shots. Also, I had to make sure that I didn't show any key components or circuitry (for obvious reasons).
[attachment=4355]
[attachment=4356]
[attachment=4357]
[attachment=4358]
RE: Todays Project - What did you do today? - sasquatch - 01-29-2013
Great projects guys!! "Handier than a pocket on a shirt!!"
RE: Todays Project - What did you do today? - Highpower - 01-29-2013
(01-29-2013, 08:04 AM)Mayhem Wrote: Nothing really special here, just a simple fix that would have been much more difficult without a lathe.
I can't count the number of simple fixes I've been able to do with nothing more than a mini-lathe. How in the world did we ever survive before our machine tools?
Seriously. It isn't like you are going to find something like that, and is an exact fit, at the local hardware store.
RE: Todays Project - What did you do today? - EdK - 01-29-2013
(01-29-2013, 09:29 AM)Highpower Wrote: Seriously. It isn't like you are going to find something like that, and is an exact fit, at the local hardware store.
I don't even think McMaster would carry that part.
Ed
RE: Todays Project - What did you do today? - Bill Gruby - 02-02-2013
Making this little vise for a watchmaker friend. It will have 3 pins to hole the wristwatch case for engraving. The thumbscrew locks the slide.
"Billy G"
RE: Todays Project - What did you do today? - DaveH - 02-02-2013
Billy,
Now that looks interesting.
DaveH
RE: Todays Project - What did you do today? - f350ca - 02-02-2013
Finally got going on a set of kitchen cabinets that I probably should have done before christmas, Was enjoying the machine shop more. They're for a reno hence no dead line which doesn't work well with my schedule or lack of. Just cutting out parts and doing the mortises and tenons. Will snap some pictures when parts start going together.
Tried filing a band saw blade. (Poor planing, the last sort of sharp one I had broke) Takes a long time to go around the blade for a 20 inch saw, but it does cut reasonably well. Surprise! Will undoubtably break now, they usually fatigue about the time they get dull.
RE: Todays Project - What did you do today? - Bill Gruby - 02-03-2013
How's this Dave? Only the tension adjustment screw to go. It will be a 6-32 screw and wing nut.
Most of there vises I have seen are round for easy articulation. Earnst has Arthritis and has lost a lot of his grip. The square is easier for him to hold.
"Bily G"