Martin Sprocket & Gear: 7 Questions I Wish I'd Asked Before My First Order

I've been handling mechanical power transmission orders for a mid-sized food plant for about seven years now. Somewhere around 200 orders, give or take. In that time, I've made mistakes that cost real money. $800 here. A week of downtime there. Nothing catastrophic, but enough to teach me a few lessons.

If you're new to Martin Sprocket & Gear—or just new to ordering this stuff—here are the questions I wish someone had answered for me. Plain answers, learned the hard way.

What does Martin Sprocket & Gear actually make?

At first, I figured the name said it all: sprockets and gears. And yeah, they make a lot of those. But their catalog covers way more than that. Here's what I've ordered from them over the years:

• Sprockets (roller chain, conveyor, engineering class)
• Gears (bevel, helical, spur, worm)
• Bearings—mounted and unmounted
• Rigid shaft couplings and flexible couplings
• Electric actuators and screw jacks
• Motors, drives, and belt drive components

The first time I opened their full catalog, I was genuinely surprised. That thing is massive. The lesson: don't assume they're a one-trick pony. If you need something in the power transmission world, it's worth checking what they carry before you source it elsewhere.

How do I find Martin Sprocket locations near me?

Another thing I got wrong early on: I assumed there was a single central warehouse. There isn't. They've got locations scattered across the US—Texas, California, Missouri, Tennessee, and other states. I don't remember every city off the top of my head, and honestly, the location list on their website is the right place to check.

But here's the mistake that actually cost me time: I called a location that wasn't the one closest to my customer, assuming all locations shared the same stock. They don't always. Inventory varies by location.

So the advice is simple. Check availability at the specific location you plan to use. Call them directly if you're in a hurry. And if you need local pickup, confirm the part is physically there before you send the truck.

How do I use the Martin Sprocket & Gear catalog without screwing up part numbers?

This one cost me real money.

I once ordered a 21-tooth sprocket when I needed a 19-tooth. Looked fine on the screen. Checked it myself. Approved it. The mismatch was obvious the moment we opened the box. $870 in parts, straight to the shelf of shame.

The Martin catalog has a logical part number system, but it's not always intuitive. If you're replacing an existing part, don't just eyeball the number. Double-check:

• Number of teeth
• Bore size (this one gets people all the time)
• Keyway width and depth
• Chain size and pitch

Also, if you're dealing with roller chain sprockets, ASME B29.1 is the standard that defines tooth profiles. If the old sprocket looks worn or nonstandard, matching the physical dimensions matters more than matching the part number. Bottom line: when in doubt, ask. It takes two minutes and it beats a $900 mistake.

What should I know before ordering rigid shaft couplings?

Rigid shaft couplings seem simple. Two metal halves, a few bolts. What's to get wrong, right?

Turns out, plenty.

My first mistake: ordering by shaft diameter only. I didn't think about keyway specs. The coupling arrived and the keyway was wrong. Minor fix, but annoying.

The bigger mistake came later. I ordered rigid couplings for a motor-to-gearbox connection. Shaft sizes were correct. Keyways were correct. Installed everything, started the motor, and it vibrated like a paint shaker. We chased it for a full day, assuming the motor was bad.

Turns out, the two shafts were misaligned by a fraction of a degree. A flexible coupling might have absorbed that. A rigid coupling does exactly what the name says—it holds the shafts rigid. Any misalignment transfers straight through.

The lesson: measure alignment before you order, not after installation. And if you can't guarantee alignment, consider a flexible coupling instead.

Electric actuator or pneumatic—which should I pick?

When I first started comparing electric actuators and pneumatic cylinders, I assumed air was always cheaper. The upfront cost is lower, especially if a facility already has compressed air. But I ignored the total cost of ownership.

On one $3,200 retrofit, I chose pneumatic because the purchase price was lower. Then came the air line installation, the regulators, the maintenance. By the time I ran the numbers, the electric actuator would have paid for itself in about 14 months.

Now I look at it differently. Pneumatic is great for simple, fast open/close action. Electric actuators win when you need precise position control or programmability. And duty cycle matters—if the actuator runs constantly, operating cost matters more than the purchase price.

Don't just compare price tags. Compare the full picture. And if you're not 100% sure which type fits, ask the supplier. Good ones will walk you through it.

What's a VFD, and why should I care?

I'll be honest: the first time someone mentioned a VFD, I nodded along like I knew what they meant. I didn't.

A VFD—variable frequency drive—is a device that controls motor speed by varying the frequency and voltage supplied to the motor. Instead of running at full speed all the time, the motor runs at whatever speed the application actually needs.

Why does that matter? It saves energy when the load doesn't need full speed. It reduces startup surge, which is easier on the motor. And it gives you speed control without changing gears or pulleys.

I became a believer the hard way. A fan motor in our facility ran at full speed 24/7 when it only needed half speed. The bearing failed about 18 months earlier than it should have. That repair cost over $1,100.

One warning though: a VFD isn't a plug-and-play gadget. If you're adding one to an existing motor, check whether the motor is rated for inverter duty. NEMA MG-1 Part 31 sets the standard for that. If the motor isn't rated for it, you can run into insulation and overheating problems.

And don't set the parameters from memory. I did that once. The motor ran backwards. That was a fun phone call.

Will Martin Sprocket & Gear take my small order seriously?

When I was starting out, I placed some pretty small orders. $200. $300. I was honestly nervous that I'd be treated like a nuisance. That fear turned out to be mostly wrong.

The small orders were handled just fine. I still use them for much larger orders today. That's the thing about good suppliers—they understand that today's small customer can be tomorrow's big one.

Sure, a small order might not get the same rush treatment as a contract order. That's a logistics reality, not disrespect. If you need faster service, ask. If you're buying through a distributor, they can usually tell you what's in stock locally.

One more thing: don't be afraid to ask questions just because you're a small buyer. I asked a lot of dumb questions when I started. I still do. It's normal.