Zinc-Plated Shell-Mold Iron Parts with Final Dimensional Acceptance
For zinc-plated iron parts, final fit depends on the condition in which each contact is accepted. Relia reviews shell-mold casting, machining and the specified coating together. Mark bores, threads and masked regions, then agree which dimensions apply before treatment and which apply to the delivered part.
The Delivered Condition Sets the Dimensional Boundary
Relia reviews the casting and specified supporting operations as one supply package. The quotation identifies the body, machining and treatment included, along with the final checks required. Coating details are agreed for the order rather than inferred from the appearance of a catalogue part.
Map Coated, Masked and Machined Zones
Mark threaded holes, bores, seating faces and other contacts that the treatment could affect. Separate surfaces requiring coverage from those requiring protection or masking. The multi-opening block examples show why a coating requirement needs more than one outside view.
The Zinc-Coating System Has a Defined Specification
Specify the applicable zinc-coating system and the acceptance information your project requires. The base material and delivered state also need approval. We do not assign a coating thickness, corrosion-life claim or pass condition without the corresponding project specification and evidence.
Casting, Machining and Treatment Follow an Agreed Sequence
Review the sequence from casting cleanup to machining, treatment and any final finishing. A functional surface may need masking or a different point of acceptance in the sequence. The agreed plan should show what is protected and which operations can alter the finished dimension.
Final Fit Is Measured in the Delivered Condition
Final fit depends on the condition in which the part is measured. Define the dimensions accepted after treatment and any areas accepted before it. This avoids comparing an uncoated measurement with a drawing requirement that applies to the finished plated component.
Masking and Contact Protection Use a Clear Region Map
Masking and contact protection need a clear region map. Include internal openings and the edges where treatment coverage changes. Appearance and coverage checks should be distinguished from the dimensional checks that determine whether the component assembles.
Records Identify the Same Part Revision and Batch
Link the material, coating and dimensional records to the same drawing revision and delivery batch. Each record describes a different requirement. Agree measured items and sampling for the order instead of treating one treatment certificate as proof of every final dimension.
The RFQ Connects Coating, Masking and Final Dimensions
Include the coating specification, masking map, final dimensional requirements and quantities with the casting drawing. Identify samples and any required treatment evidence. The quote can then cover an accepted plated part rather than an unfinished casting followed by an undefined coating instruction.
Send the Masking Map and Final Fit Requirements
Send the component and masking drawings with the final fits marked. Add the applicable coating requirement, material, quantities and needed records. We can review the operation sequence and the sample checks for the delivered plated component.
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