Cap and Rod Grinding Machine DM50/DM100
The DM50 and DM100 grind connecting rods and their end faces, which is the operation that comes before a rod big end can be resized. When a rod is reconditioned the cap face has to be ground flat and square so that, once bolted up, the big end bore closes to a true circle again. On the DM100 the grinding head moves lon...
What This Machine Does
The DM50 and DM100 grind connecting rods and their end faces, which is the operation that comes before a rod big end can be resized. When a rod is reconditioned the cap face has to be ground flat and square so that, once bolted up, the big end bore closes to a true circle again. On the DM100 the grinding head moves longitudinally on a guide screw, and stock removal is set by a handwheel with scales, so the operator reads off how much is coming off rather than guessing. A shim plate under the work allows a small adjustment of the parallelism between the workpiece grinding face and the end face of the grinding wheel, which is what makes it possible to grind the face square rather than tapered. The trailing bar shifts laterally through a gear and rack, so grinding speed across the face can be varied to suit the job. The DM50 is a smaller lighter machine of simple construction, easy to move and operate.
Why Buyers Choose This Machine
- Grinds rod and cap end faces flat and square so the big end bore closes round when bolted up
- Handwheel with scales gives a direct reading of grinding removal rather than a feel for it
- Guide screw longitudinal head movement keeps the head steady through the pass
- Adjustable shim plate corrects parallelism between the work face and the wheel end face
- Gear-rack lateral shift of the trailing bar allows different grinding speeds across the face
- DM50 is compact light and easy to move for shops without the floor space for a fixed machine
- Keeps rod reconditioning in-house instead of buying replacement rods
Where Cap and Rod Grinding Machine DM50 Earns Its Place
Problems It Solves
- A big end bore cannot be brought back round unless the cap faces are ground flat and square first
- Hand grinding a cap face leaves it tapered and the bore closes oval
- Without a scaled handwheel the operator cannot control how much material is coming off the cap
- Buying replacement connecting rods costs far more than reconditioning the ones in the engine
- Small shops have no floor space for a large dedicated rod machine
Who It Is For
- Engine rebuilders who resize connecting rod big ends
- Automotive repair shops reconditioning rods rather than replacing them
- Agricultural and small plant machinery workshops
- Distributors equipping compact engine rebuild workshops in export markets
Application Scenarios
- Grinding cap faces before resizing a connecting rod big end
- Reconditioning stretched or distorted rods in an engine rebuild shop
- Grinding rod end faces on car and light commercial engines
- Small workshop rod work where the machine has to be moved between benches
- Batch rod preparation ahead of honing the big end bore
Technical Detail
Technical Features
- Longitudinal movement of the grinding head on a guide screw
- Handwheel with scales for controlled grinding removal
- Adjustable shim plate for parallelism between workpiece face and wheel end face
- Gear-rack lateral shifting of the trailing bar
- Adjustable grinding speeds across the work face
- DM50 compact lightweight construction for easy moving
- Simple mechanical structure for straightforward maintenance
Specifications
| Machine type | Cap and rod grinding machine |
|---|---|
| Models | DM50 / DM100 |
| Head movement | Longitudinal on guide screw |
| Removal control | Handwheel with scales |
| Parallelism adjustment | Adjustable shim plate |
| Lateral shift | Gear-rack structure on trailing bar |
| Applications | Grinding connecting rods and rod end faces |
Figures above are taken from the product information we hold. Send us your application and we will confirm the exact specification for the model quoted.
How It Is Built and What Can Be Changed
Operations Performed
- Surface grinding
- Cap face grinding
- Rod end face grinding
Quality Control
- Flatness and squareness of a ground test face checked before shipment
- Handwheel scale calibration verified against measured removal
- Grinding wheel end-face run-out checked on assembly
- Shim plate adjustment range tested through its travel
- Machine run in and sample rod face ground before packing
Customisation Options
- DM50 or DM100 chosen for the rod sizes and the floor space you have
- Grinding wheel specification matched to your rod material
- Fixturing quoted for the connecting rod types you run
- Supply voltage and frequency set for your market
- Manual prepared in your working language
How It Compares With the Alternatives
| Con-rod bushing boring machine T8216 / T8210D | The boring machine handles the small end bush; the DM50 and DM100 grind the cap and rod end faces, which is the big end side of the same rod job |
|---|---|
| Hand grinding a cap on a bench grinder | A bench grinder cannot hold the cap face parallel to the wheel; the shim plate and scaled handwheel on these machines set parallelism and removal deliberately |
| Replacing connecting rods | Grinding and resizing recovers rods that are otherwise sound, which on a multi-cylinder engine avoids a full set of replacement parts |
Running the Machine
Step 1
Split the rod and clean the cap and rod mating faces
Step 2
Clamp the cap or rod with the grinding face presented to the wheel
Step 3
Adjust the shim plate until the work face is parallel to the wheel end face
Step 4
Set the grinding removal on the scaled handwheel
Step 5
Use the gear-rack lateral shift to suit the grinding speed to the job
Step 6
Grind until the face cleans up and check it is flat and square
Step 7
Bolt the rod up and check the big end bore before honing or resizing
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Questions About Cap and Rod Grinding Machine DM50
What is the difference between DM50 and DM100?
The DM50 is the small size light weight version with simple construction, easy to move and operate. The DM100 is the larger machine with guide screw head movement. Send us the rods you work on and we will confirm which fits.
How is grinding removal controlled?
By a handwheel with scales, so the amount taken off the face is set and read directly rather than judged by feel.
How do I get the cap face square to the wheel?
The shim plate is adjusted slightly to regulate the parallelism between the grinding face of the workpiece and the end face of the grinding wheel.
Does the machine resize the big end bore as well?
No. It grinds the rod and cap faces. The bore is then resized on a separate operation, which is why the face grinding has to be flat and square.
What grinding wheel does it use?
Wheel specification depends on your rod material. Tell us what you are grinding and we will quote a suitable wheel with the machine.
How is the machine packed and shipped?
Crated for sea freight, with fumigated timber where your import rules require it. Send us your destination port for an FOB CFR or CIF price.
What are your payment terms?
30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the Cap and Rod Grinding Machine DM50
Send us the work you need it to do, the voltage on your site and the port you ship to. We will come back with the model, the tooling and the lead time.