Grizzly metric threading table corrected

Metric threading, “b” gear engages the 120 tooth idler gear

Carriage travel in mm per spindle revolution

Top row is the “a” gear, left column is the “b” gear.

Gear box in position IA

1.0000

1.4815

1.6296

1.6667

1.7037

1.7778

1.9259

2.0741

2.2222

0.9000

1.2000

1.4667

1.5000

1.5333

1.6000

1.7333

1.8667

2.0000

0.8182

1.0909

1.2121

1.3636

1.3939

1.4545

1.5758

1.6970

1.8182

0.8000

1.0667

1.1852

1.3037

1.3630

1.4222

1.5407

1.6593

1.7778

0.7826

1.0435

1.1594

1.2754

1.3043

1.3913

1.5072

1.6232

1.7391

0.7500

1.0000

1.1111

1.2222

1.2500

1.2778

1.4444

1.5556

1.6667

0.6923

0.9231

1.0256

1.1282

1.1538

1.1795

1.2308

1.4359

1.5385

0.6429

0.8571

0.9524

1.0476

1.0714

1.0952

1.1429

1.2381

1.4286

0.6000

0.8000

0.8889

0.9778

1.0000

1.0222

1.0667

1.1556

1.2444

Gear box in position IIA

0.8330

1.2341

1.3575

1.3883

1.4192

1.4809

1.6043

1.7277

1.8511

0.7497

0.9996

1.2217

1.2495

1.2773

1.3328

1.4439

1.5549

1.6660

0.6815

0.9087

1.0097

1.1359

1.1612

1.2116

1.3126

1.4136

1.5145

0.6664

0.8885

0.9873

1.0860

1.1353

1.1847

1.2834

1.3822

1.4809

0.6519

0.8692

0.9658

1.0624

1.0865

1.1590

1.2555

1.3521

1.4487

0.6248

0.8330

0.9256

1.0181

1.0413

1.0644

1.2032

1.2958

1.3883

0.5767

0.7689

0.8544

0.9398

0.9612

0.9825

1.0252

1.1961

1.2815

0.5355

0.7140

0.7933

0.8727

0.8925

0.9123

0.9520

1.0313

1.1900

0.4998

0.6664

0.7404

0.8145

0.8330

0.8515

0.8885

0.9626

1.0366

Gear box in position IIIA

1.1667

1.7280

1.9008

1.9445

1.9877

2.0741

2.2470

2.4198

2.5927

1.0500

1.4000

1.7107

1.7501

1.7889

1.8667

2.0223

2.1778

2.3334

0.9546

1.2728

1.4142

1.5910

1.6263

1.6970

1.8384

1.9799

2.1213

0.9334

1.2445

1.3828

1.5210

1.5902

1.6593

1.7976

1.9359

2.0741

0.9131

1.2174

1.3527

1.4880

1.5218

1.6232

1.7585

1.8938

2.0290

0.8750

1.1667

1.2963

1.4260

1.4584

1.4908

1.6852

1.8149

1.9445

0.8077

1.0770

1.1966

1.3163

1.3462

1.3761

1.4359

1.6753

1.7949

0.7500

1.0000

1.1111

1.2223

1.2500

1.2778

1.3334

1.4445

1.6667

0.7000

0.9334

1.0371

1.1408

1.1667

1.1926

1.2445

1.3482

1.4519

Metric – data in mm

Metric threading, “b” gear engages the 120 tooth idler gear

Carriage travel in mm per spindle revolution

Top row is the “a” gear, left column is the “b” gear.

Gear box in position IB

2.0000

2.9630

3.2593

3.3333

3.4074

3.5556

3.8519

4.1481

4.4444

1.8000

2.4000

2.9333

3.0000

3.0667

3.2000

3.4667

3.7333

4.0000

1.6364

2.1818

2.4242

2.7273

2.7879

2.9091

3.1515

3.3939

3.6364

1.6000

2.1333

2.3704

2.6074

2.7259

2.8444

3.0815

3.3185

3.5556

1.5652

2.0870

2.3188

2.5507

2.6087

2.7826

3.0145

3.2464

3.4783

1.5000

2.0000

2.2222

2.4444

2.5000

2.5556

2.8889

3.1111

3.3333

1.3846

1.8462

2.0513

2.2564

2.3077

2.3590

2.4615

2.8718

3.0769

1.2857

1.7143

1.9048

2.0952

2.1429

2.1905

2.2857

2.4762

2.8571

1.2000

1.6000

1.7778

1.9556

2.0000

2.0444

2.1333

2.3111

2.4889

Gear box in position IIB

1.6660

2.4681

2.7150

2.7767

2.8384

2.9618

3.2086

3.4554

3.7022

1.4994

1.9992

2.4435

2.4990

2.5545

2.6656

2.8877

3.1099

3.3320

1.3631

1.8175

2.0194

2.2718

2.3223

2.4233

2.6252

2.8272

3.0291

1.3328

1.7771

1.9745

2.1720

2.2707

2.3694

2.5669

2.7643

2.9618

1.3038

1.7384

1.9316

2.1248

2.1730

2.3179

2.5111

2.7042

2.8974

1.2495

1.6660

1.8511

2.0362

2.0825

2.1288

2.4064

2.5916

2.7767

1.1534

1.5378

1.7087

1.8796

1.9223

1.9650

2.0505

2.3922

2.5631

1.0710

1.4280

1.5867

1.7453

1.7850

1.8247

1.9040

2.0627

2.3800

0.9996

1.3328

1.4809

1.6290

1.6660

1.7030

1.7771

1.9252

2.0732

Gear box in position IIIB

2.3340

3.4578

3.8036

3.8900

3.9764

4.1493

4.4951

4.8409

5.1867

2.1006

2.8008

3.4232

3.5010

3.5788

3.7344

4.0456

4.3568

4.6680

1.9096

2.5462

2.8291

3.1827

3.2535

3.3949

3.6778

3.9607

4.2436

1.8672

2.4896

2.7662

3.0428

3.1812

3.3195

3.5961

3.8727

4.1493

1.8266

2.4355

2.7061

2.9767

3.0443

3.2473

3.5179

3.7885

4.0591

1.7505

2.3340

2.5933

2.8527

2.9175

2.9823

3.3713

3.6307

3.8900

1.6158

2.1545

2.3938

2.6332

2.6931

2.7529

2.8726

3.3514

3.5908

1.5004

2.0006

2.2229

2.4451

2.5007

2.5563

2.6674

2.8897

3.3343

1.4004

1.8672

2.0747

2.2821

2.3340

2.3859

2.4896

2.6971

2.9045

Metric – data in mm

Metric threading, “b” gear engages the 120 tooth idler gear

Carriage travel in mm per spindle revolution

Top row is the “a” gear, left column is the “b” gear.

Gear box in position IC

0.5000

0.7407

0.8148

0.8333

0.8519

0.8889

0.9630

1.0370

1.1111

0.4500

0.6000

0.7333

0.7500

0.7667

0.8000

0.8667

0.9333

1.0000

0.4091

0.5455

0.6061

0.6818

0.6970

0.7273

0.7879

0.8485

0.9091

0.4000

0.5333

0.5926

0.6519

0.6815

0.7111

0.7704

0.8296

0.8889

0.3913

0.5217

0.5797

0.6377

0.6522

0.6957

0.7536

0.8116

0.8696

0.3750

0.5000

0.5556

0.6111

0.6250

0.6389

0.7222

0.7778

0.8333

0.3462

0.4615

0.5128

0.5641

0.5769

0.5897

0.6154

0.7179

0.7692

0.3214

0.4286

0.4762

0.5238

0.5357

0.5476

0.5714

0.6190

0.7143

0.3000

0.4000

0.4444

0.4889

0.5000

0.5111

0.5333

0.5778

0.6222

Gear Box in position IIC

0.4165

0.6170

0.6787

0.6942

0.7096

0.7404

0.8021

0.8639

0.9256

0.3749

0.4998

0.6109

0.6248

0.6386

0.6664

0.7219

0.7775

0.8330

0.3408

0.4544

0.5048

0.5680

0.5806

0.6058

0.6563

0.7068

0.7573

0.3332

0.4443

0.4936

0.5430

0.5677

0.5924

0.6417

0.6911

0.7404

0.3260

0.4346

0.4829

0.5312

0.5433

0.5795

0.6278

0.6761

0.7243

0.3124

0.4165

0.4628

0.5091

0.5206

0.5322

0.6016

0.6479

0.6942

0.2883

0.3845

0.4272

0.4699

0.4806

0.4913

0.5126

0.5981

0.6408

0.2678

0.3570

0.3967

0.4363

0.4463

0.4562

0.4760

0.5157

0.5950

0.2499

0.3332

0.3702

0.4072

0.4165

0.4258

0.4443

0.4813

0.5183

Gear box in position IIIC

0.5834

0.8642

0.9506

0.9723

0.9939

1.0371

1.1235

1.2099

1.2963

0.5250

0.7000

0.8556

0.8750

0.8945

0.9334

1.0111

1.0889

1.1667

0.4773

0.6364

0.7071

0.7955

0.8132

0.8485

0.9192

0.9899

1.0606

0.4667

0.6222

0.6914

0.7605

0.7951

0.8297

0.8988

0.9679

1.0371

0.4565

0.6087

0.6763

0.7440

0.7609

0.8116

0.8793

0.9469

1.0145

0.4375

0.5834

0.6482

0.7130

0.7292

0.7454

0.8426

0.9074

0.9723

0.4039

0.5385

0.5983

0.6581

0.6731

0.6881

0.7180

0.8376

0.8975

0.3750

0.5000

0.5556

0.6111

0.6250

0.6389

0.6667

0.7222

0.8334

0.3500

0.4667

0.5185

0.5704

0.5834

0.5963

0.6222

0.6741

0.7259

Metric – data in mm

Gear ratios and formulas.

Ratio of gear train output (input to gear box) = Z
Z = 40/60 x “a”/127 x 120/”b”
Example: “a” = 44, “b” = 46
One turn of the spindle will result in 0.6025 turns of the gearbox input shaft.
The lead screw is 12 TPI or 0.0833” or 2.1167mm.

Gear box ratios:
Position “A” = 1:1
Position “B” = 1:2
Position “C” = 2:1

Position I = 1:1
Position II = 1:0.833
Position III = 1:1.1667

Overall gearbox ratios:

0.4165

0.8330

1.6660

0.5000

1.0000

2.0000

III

0.5834

1.1667

2.3340

One turn on the input shaft will result in the lead screw turning at the rate shown in the above table.

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